Document:

March
      14,
      2007

    

    Paul
      Galleberg

    2721
      Via
      Elevado

    Palos
      Verdes Estates, CA 90274

    

    Dear
      Paul:

     

    The
      purpose of this letter is to document the Allegro Biodiesel Corporation (the
      “Company”) Board of Director’s (the “Board’s”) agreement with you regarding your
      continued Board service following the engagement of PV Asset Management, LLC
      (“PVAM”), of which you are a principal, pursuant to the services agreement by
      and between PVAM and Allegro Biodiesel Corporation (the “Company”), dated as of
      February 5, 2007 (the “Services Agreement”). 

     

    During
      the time PVAM is engaged by the Company under the Services Agreement, you will
      continue to serve as a director of the Company and continue to vest in the
      stock
      options previously awarded to you as an independent director. You, however,
      will
      not receive any cash fees for services as an independent director (as provided
      for in the Company’s 2006 Incentive Compensation Plan, as amended) for the
      second or third calendar quarters of 2007 if the Services Agreement continues
      in
      force during such quarters. Notwithstanding the preceding sentence, the Company
      shall have the right to remove you from any position in the event that, by
      order
      of a court of competent jurisdiction, you are found directly liable for gross
      negligence or willful misconduct in connection with the provision of services
      under the Services Agreement.

     

    If
      a
      Change of Control (as defined below) occurs after the date hereof with respect
      to the Company within six years of the later of (i) the termination of the
      term
      of the Services Agreement, as may be extended, or (ii) the date that you
      otherwise cease to serve as an officer or director of the Company (such later
      date, the “Termination Date”), then the Company shall purchase a “tail”
directors and officers liability coverage policy that shall name you as
      additional named insured. The maximum coverage amount of such policy shall
      be
      appropriate for a Company of the type and size of the Company or the date the
      policy is purchased, but in any event, not less than $10 million. The term
      of
      the policy shall be not less than six years less the period of time lapsed
      since
      the Termination Date. “Change
      in Control” shall mean the first to occur of any of the following
      events:

     

    (i) A
      transaction or series of transactions (other than an offering of equity
      securities by the Company) whereby any “person” or related “group” of “persons”
(as such terms are used in Sections 13(d) and 14(d)(2) of the Securities
      Exchange Act of 1934, as amended (the “Exchange Act”)) (other than the Company,
      any of its subsidiaries, an employee benefit plan maintained by the Company
      or
      any of its subsidiaries or a “person” that, prior to such transaction, directly
      or indirectly controls, is controlled by, or is under common control with,
      the
      Company) directly or indirectly acquires beneficial ownership (within the
      meaning of Rule 13d-3 under the Exchange Act) of securities of the Company
      possessing more than 50% of the total combined voting power of the Company’s
      securities outstanding immediately after such acquisition;

     

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    (ii) During
      any twelve-month period, individuals who, at the beginning of such period,
      constitute the Board together with any new director(s) (other than a director
      designated by a person who shall
      have
      entered into an agreement with the Company to effect a transaction
      described
      in the
      immediately preceding or subsequent paragraph) whose election by the Board
      or
      nomination for election by the Company’s stockholders was approved by a vote of
      at least a majority of the directors then still in office who either were
      directors at the beginning of the twelve-month period or whose election or
      nomination for election was previously so approved, cease for any reason to
      constitute a majority thereof; or 

     

    (iii) The
      consummation by the Company (whether directly involving the Company or
      indirectly involving the Company through one or more intermediaries) of (x)
      a
      merger, consolidation, reorganization, or business combination or (y) a sale
      or
      other disposition of all or substantially all of the Company’s assets in any
      single transaction or series of related transactions or (z) the acquisition
      of
      assets or stock of another entity, in each case other than a
      transaction
      that
      results in the Company’s voting securities outstanding immediately before the
      transaction continuing to represent (either by remaining outstanding or by
      being
      converted into voting securities of the Company or the person that, as a result
      of the transaction, controls, directly or indirectly, the Company or owns,
      directly or indirectly, all or substantially all of the Company’s assets or
      otherwise succeeds to the business of the Company (the Company or such person,
      the “Successor Entity”)) directly or indirectly, at least a majority of the
      combined voting power of the Successor Entity’s outstanding voting securities
      immediately after the transaction.

     

    If
      the
      terms of this letter agreement are acceptable to you, please return a signed
      copy to me at the Company’s headquarters at your earliest convenience.

     

    Sincerely,

     

    

    /s/
      W.
      Bruce Comer
      III                   

    W.
      Bruce
      Comer, III

    Chief
      Executive Officer

    

    

    Acknowledged
      and Agreed.

    

    

    /s/
      Paul
      Galleberg     Date:
      March 14, 2007

    Paul
      Galleberg

     

     

    
      
         

      

      
        -2-EXHIBIT
      4.1

    

    PROMISSORY
      NOTE 

    

    TERM
      SHEET

    Bridge
      Note

    

    
      	
              Maker:

            	
              ATSI
                Communications, Inc.

            
	 	 
	
              Interest:

            	
              12%
                per annum

            
	 	 
	
              Term:

            	
              Six
                Months

            
	 	 
	
              Payment
                Terms:

            	
              Interest
                paid monthly in arrears, Principal paid upon maturity

            
	 	 
	
              Mandatory
                Prepayment:

            	
              Upon
                Closing of equity offering in the amount of at least
                $2,000,000

            
	 	 
	
              Conversion
                Option:

            	
              Principal
                and accrued and unpaid interest may be converted into securities
                offered
                in any equity offering during the term on the same terms offered
                to other
                investors.

            
	 	 
	
              Other
                Terms:

            	
              As
                set forth in attached form of Promissory
                Note.

            

    

    
      

      NOTHING
        IN THIS LETTER SHOULD BE CONSIDERED TO BE AN OFFER TO SELL OR THE SOLICIATION
        OF
        AN OFFER TO BUY ANY SECURITIES. AN OFFER TO SELL OR SOLICIATION OF OFFERS
        TO BUY
        WILL BE MADE, IF AT ALL, BY DELIVERY OF A PRIVATE PLACEMENT MEMORANDUM
        DESCRIBING THE SECURITIES OFFERED.

    

    
      1

      
        

      

    

    

    

    NEITHER
      THIS NOTE NOR ANY SECURITY ISSUED UPON THE CONVERSION HEREOF HAVE BEEN
      REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED, OR THE
      SECURITIES LAWS OF ANY STATE. NEITHER THIS NOTE NOR SUCH SECURITIES MAY BE
      SOLD,
      PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED AT ANY TIME, EXCEPT UPON (1)
      SUCH
      REGISTRATION, OR (2) DELIVERY TO THE ISSUER OF THIS NOTE OR SUCH SECURITIES
      OF
      AN OPINION OF COUNSEL REASONABLY ACCEPTABLE TO THE ISSUER THAT REGISTRATION
      IS
      NOT REQUIRED FOR SUCH TRANSFER.

    

    

    ATSI
      COMMUNICATIONS, INC.

    

    

    
      	November 28,
              2006 	
              San
                Antonio,
                Texas

            	
              $_______________

            

    

     

    ATSI
      COMMUNICATIONS, INC.,
      a
      Nevada corporation with offices at 3201 Cherry Ridge, Building C, Suite 300,
      San
      Antonio, Texas 78230 (hereinafter referred to as "ATSI”),
      for
      value received, hereby promises to pay to _________________________________,
      a
      ________________________
      (the
      "Payee”),
      at
      _______________________________________, or Payee’s registered assigns at the
      address designated by such assigns in writing, the sum of
      _______________________________ AND __/100 DOLLARS ($___________________),
      together with interest on the unpaid principal balance hereof from the date
      hereof until payment in full, in lawful money of the United States of America
      which shall be legal tender for the payment of debts from time to time, at
      a per
      annum rate of Twelve Percent (12%) prior to maturity. All past due principal,
      and, to the extent permitted by applicable law, past due interest, on this
      Note
      shall bear interest from and after maturity until paid at a per annum rate
      equal
      to the lesser of (i) Fifteen Percent (15%), or (ii) the maximum nonusurious
      rate
      allowable under applicable law. 

    

    1. Interest
      and Principal Payments.
      Interest only is payable monthly on the last day of each calendar month
      beginning on the last day of the first calendar month that commences on or
      after
      the date of this Note, and continuing regularly and quarterly on the last day
      of
      every calendar month thereafter until the last day of the sixth calendar month
      that commences on or after the date of this Note, on which date the entire
      unpaid principal balance hereof, together with all accrued but unpaid interest,
      shall mature and become due and payable. All payments received hereon by Payee
      shall be applied first to accrued but unpaid interest, and the balance, if
      any,
      shall be returned to ATSI, except in those instances in which principal payment
      is required or prepayment is permitted hereunder, in which event such balance
      shall be applied to the principal remaining unpaid hereon, up to the amount
      due
      or permitted to be prepaid, as applicable.

    

    2. Events
      of Default.
      The
      occurrence and continuation of any one of the following events or conditions
      shall constitute an "Event
      of Default”:

     

    
      
        

        NOTHING
          IN THIS LETTER SHOULD BE CONSIDERED TO BE AN OFFER TO SELL OR THE SOLICIATION
          OF
          AN OFFER TO BUY ANY SECURITIES. AN OFFER TO SELL OR SOLICIATION OF OFFERS
          TO BUY
          WILL BE MADE, IF AT ALL, BY DELIVERY OF A PRIVATE PLACEMENT MEMORANDUM
          DESCRIBING THE SECURITIES OFFERED.

      

      
        2

        
          

        

      

      

      

       

    

    (a) ATSI
      fails to make any payment of principal or interest, within ten (10) business
      days after the date such payment is due under the Note; or

    

    (b) ATSI
      makes an assignment for the benefit of creditors or becomes insolvent or unable
      to pay its debts generally as they become due, or applies to any tribunal for
      the appointment of a trustee or receiver for a substantial part of the assets
      of
      ATSI, or commences any proceedings relating to ATSI under any bankruptcy,
      reorganization, arrangement, insolvency, readjustment of debts, dissolution
      or
      other liquidation law of any jurisdiction; or any such application is filed,
      or
      any such proceedings are commenced against ATSI and ATSI indicates its consent
      to such proceedings, or an order is entered appointing such trustee or receiver,
      or approving the petition in any bankruptcy, reorganization, arrangement,
      insolvency, readjustment of debt, dissolution or other liquidation proceedings,
      and such order remains in effect for one hundred twenty (120) days.

    

    3. Remedies.
      Upon
      the occurrence of an Event of Default, the Payee or other holder of this Note
      may declare the entire unpaid principal of this Note, and all accrued but unpaid
      interest thereon, at once due and payable, and upon any such declaration the
      principal of this Note and such accrued but unpaid interest shall become and
      be
      immediately due and payable, and the Payee or any other holder of this Note
      may
      thereupon proceed to protect and enforce its rights, either by suit in equity
      or
      by action at law or by other appropriate proceedings, whether for specific
      performance (to the extent permitted by law) of any covenant or agreement
      contained herein or in aid of the exercise of any power granted herein, or
      proceed to enforce the payment of this Note or to enforce any other legal or
      equitable right of the Payee or such other holder. 

    

    4. Conversion
      Rights.
      In the
      event ATSI issues or sells any shares of its Common Stock, $.001 par value
      per
      share or securities exchangeable for or convertible into its Common Stock,
      $.001
      par value per share prior to the maturity of this Note, the holder of this
      Note
      may tender it to ATSI in exchange for such securities at the price and on the
      terms such securities are sold to others.

    

    5. Usury.
      It is
      expressly provided and stipulated that notwithstanding any provision of this
      Note or any other instrument evidencing or securing the indebtedness evidenced
      hereby, in no event shall the aggregate of all interest paid by ATSI to the
      Payee hereunder ever exceed the Maximum Nonusurious Rate of interest (as
      hereinafter defined) which may lawfully be charged ATSI under the laws of the
      State of Texas or the United States Federal Government, as applicable, on the
      principal balance of this Note remaining unpaid. If under any circumstances
      the
      aggregate amounts paid on the indebtedness evidenced by this Note prior to
      and
      incident to the final payment hereof include amounts which by law are deemed
      interest and which would exceed the Maximum Nonusurious Rate of interest which
      could lawfully have been charged or collected on this Note, ATSI stipulates
      that

    
      
        

        NOTHING
          IN THIS LETTER SHOULD BE CONSIDERED TO BE AN OFFER TO SELL OR THE SOLICIATION
          OF
          AN OFFER TO BUY ANY SECURITIES. AN OFFER TO SELL OR SOLICIATION OF OFFERS
          TO BUY
          WILL BE MADE, IF AT ALL, BY DELIVERY OF A PRIVATE PLACEMENT MEMORANDUM
          DESCRIBING THE SECURITIES OFFERED.

      

      
        3

        
          

        

      

      

      

    (a) any
      non-principal payment shall be characterized as an expense, fee, or premium
      rather than as interest, and any excess shall be credited hereon by the holder
      hereof (or, if this Note shall have been paid in full, refunded to ATSI);
      and

    

    (b) determination
      of the rate of interest for determining whether the indebtedness evidenced
      hereby is usurious shall be made by amortizing, prorating, allocating, and
      spreading, in equal parts during the full stated term of such indebtedness,
      all
      interest at any time contracted for, charged, or received from ATSI in
      connection with such indebtedness, and any excess shall be canceled, credited
      or
      refunded as set forth in (a) herein. 

    

    The
      "Maximum Nonusurious Rate of interest" which may be charged as herein
      contemplated shall be the indicated rate ceiling from time to time in effect
      pursuant to the applicable provisions of the Texas Finance Code, as amended,
      provided that Payee may also rely on any alternative Maximum Nonusurious Rate
      of
      interest provided by other applicable laws if such other rates are higher than
      that allowed by said Article, as amended.

    

    THIS
      NOTE IS SUBJECT TO FINAL ACCEPTANCE IN, AND ALL TERMS, OBLIGATIONS, AND
      PROVISIONS OF THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH
      THE LAWS OF, THE STATE OF TEXAS.

    

    IN
      WITNESS WHEREOF, ATSI has authorized this Note to be executed in its corporate
      name by its duly authorized officer as of the date first above
      written.

    

    ATSI
      COMMUNICATIONS, INC.

    

     

    By:
      _____________________________________

    Name:
      Antonio Estrada 

    Title:
      Corporate Controller  

     

    
      
        

        NOTHING
          IN THIS LETTER SHOULD BE CONSIDERED TO BE AN OFFER TO SELL OR THE SOLICIATION
          OF
          AN OFFER TO BUY ANY SECURITIES. AN OFFER TO SELL OR SOLICIATION OF OFFERS
          TO BUY
          WILL BE MADE, IF AT ALL, BY DELIVERY OF A PRIVATE PLACEMENT MEMORANDUM
          DESCRIBING THE SECURITIES OFFERED.

      

        4

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