The effected portion will, however, always come out the main output. Filters add or subtract sonic information by cutting or boosting certain frequencies or ranges of a particular sonic spectrum. There are many different types of filters and each one has its own unique affect on a sound. A low pass filter, for example, allows low frequencies to come through while cutting down on high frequencies. Try different filters and determine which one gives you the sound you are looking for by trying different ones.
Filters become much more interesting when they change their parameters in real time.
This can be done by assigning a particular filter paramter like cutoff frequency, depth of boost or cut, or modulation rate to a MIDI controller so you can control the filter manually or by assigning it to a modulation source like a Low Frequency Oscillator that will automatically change a filter over time in response to a driving modulation source. There are 2 outputs on the Xtreme Lead sound module. Yes, you can upgrade your Xtreme Lead sound module with the turbo option. There are several different sound sets available for your Xtreme Lead sound module. Please see the Sounds section under the Xtreme Lead section of this web site to learn what sound sets are available.