[Connected Car] RichieB:
I did some more testing with PowerAMP 1.4 and renice. I even started to renice other processes and threads that looked related to audio processing. Nothing seems to help the skipping problem when using TomTom. I'm starting to believe the Parrot Music Player uses the hardware in a way other apps don't or can't, so it will always have a severe advantage.

I did notice the process /system/xbin/ck5050 using a lot of CPU when playing music (using PowerAMP). The CK5050 seems to be a Parrot chip that handles audio, bluetooth, iPod connectivity and voice recognition. Since this is not usually found in Android devices, there is little chance other music players will ever fully support it I suppose.

root 1373 1 90744 18344 ffffffff afd0c57c S /system/xbin/ck5050
root 1384 1373 90744 18344 c0192274 afd0c798 S sup log
root 1386 1373 90744 18344 c04a9c38 afd0b4bc S ParrotAL_UART-0
root 1389 1373 90744 18344 00000000 afd0b8a4 R CKCM SERVER
root 1390 1373 90744 18344 c0192274 afd0c798 S ParrotAL_TIMER
root 1391 1373 90744 18344 c0192274 afd0c798 S ParrotAL_TIMER_
root 1599 1373 90744 18344 c0192274 afd0c798 S Blues_Task
root 1607 1373 90744 18344 c02d36d0 afd0b4bc S ParrotAL_UART-1
root 1608 1373 90744 18344 c0192274 afd0c798 S SOUL Task
root 1621 1373 90744 18344 c01f2aa0 afd0c5fc S PAudio
root 1630 1373 90744 18344 c0192274 afd0c798 S TAMTAM main thr
root 1635 1373 90744 18344 c0192274 afd0c798 S DiscoiPodSEND_t
root 1636 1373 90744 18344 c0192274 afd0c798 S DiscoiPodINTERP
root 1637 1373 90744 18344 c0192274 afd0c798 S DiscoiPodAUTHEN
root 1638 1373 90744 18344 c0192274 afd0c798 S Disco_DCODB_Get
root 1639 1373 90744 18344 c0192274 afd0c798 S Disco_DCODB_Set
root 1640 1373 90744 18344 c01f2aa0 afd0b8a4 S Juba monitor
root 1641 1373 90744 18344 c0192274 afd0c798 S Settings
root 1642 1373 90744 18344 c0192274 afd0c798 S Concertos_Notif
root 1643 1373 90744 18344 c0192274 afd0c798 S Concertos_Contr
root 1644 1373 90744 18344 c0266b54 afd0d050 S pal_ppp_notify
root 1645 1373 90744 18344 c0192274 afd0c798 S modman_engine
root 1646 1373 90744 18344 c0215e7c afd0c57c S modman_device
root 1651 1373 90744 18344 c01f2aa0 afd0b8a4 S Juba monitor
root 1652 1373 90744 18344 c0192274 afd0c798 S EXTI task
root 1653 1373 90744 18344 c0192274 afd0c798 S BLI task
root 1654 1373 90744 18344 c0192274 afd0c798 S Phonebook
root 1655 1373 90744 18344 c0192274 afd0c798 S Audio
root 1656 1373 90744 18344 00000000 afd0b8a4 R Init
root 1657 1373 90744 18344 00000000 afd0c798 R Init
root 1658 1373 90744 18344 c0192274 afd0c798 S Concertos_File
root 1659 1373 90744 18344 00000000 afd0c798 R Init
root 1660 1373 90744 18344 00000000 afd0c798 R Init
root 1661 1373 90744 18344 00000000 afd0c798 R Init
root 1662 1373 90744 18344 c0189220 afd0be0c S PlayFD
root 1663 1373 90744 18344 c0192274 afd0c798 S Concertos_Upnp_
root 1664 1373 90744 18344 c0192274 afd0c798 S Concertos_Andro
root 1665 1373 90744 18344 c03fdc98 afd0b75c S Concertos_Binde
root 1666 1373 90744 18344 c0192274 afd0c798 S Concertos_Andro
root 1667 1373 90744 18344 c0192274 afd0c798 S Concertos_Andro
root 1668 1373 90744 18344 c0192274 afd0c798 S Concertos_Andro
root 1669 1373 90744 18344 c0192274 afd0c798 S Concertos_Andro
root 1670 1373 90744 18344 c03fdc98 afd0b75c S Binder Thread #
root 1671 1373 90744 18344 c0192274 afd0c798 S Concertos_Andro
root 1672 1373 90744 18344 c0192274 afd0c798 S Concertos_Andro
root 1673 1373 90744 18344 c0192274 afd0c798 S Concertos_Andro
root 1674 1373 90744 18344 c0192274 afd0c798 S Concertos_Andro
root 1675 1373 90744 18344 c0192274 afd0c798 S Concertos_Andro
root 1676 1373 90744 18344 c0192274 afd0c798 S Concertos_Exti
root 1677 1373 90744 18344 c01f2aa0 afd0b8a4 S Juba monitor
root 1678 1373 90744 18344 c0192274 afd0c798 S Concertos_iPodN
root 1679 1373 90744 18344 c0192274 afd0c798 S Concertos_File
root 1680 1373 90744 18344 c0192274 afd0c798 S Concertos_FileM
root 1681 1373 90744 18344 c0192274 afd0c798 S REQ_BROWSING
root 1682 1373 90744 18344 c0192274 afd0c798 S RapContext
root 1683 1373 90744 18344 c0192274 afd0c798 S RapEvent
root 1684 1373 90744 18344 c0192274 afd0c798 S RapProcedure
root 1685 1373 90744 18344 c01f2aa0 afd0b8a4 S Juba monitor
root 1686 1373 90744 18344 c03fdc98 afd0b75c S AudioBinder_MED
root 1687 1373 90744 18344 c03fdc98 afd0b75c S AudioBinder_PHO
root 1688 1373 90744 18344 c03fdc98 afd0b75c S AudioBinder_SON
root 1689 1373 90744 18344 c03fdc98 afd0b75c S AudioBinder_TTS
root 1690 1373 90744 18344 c03fdc98 afd0b75c S AudioBinder__In
root 1691 1373 90744 18344 c0192274 afd0c798 S HSTI.WaitCmd
root 1692 1373 90744 18344 c01f2aa0 afd0b8a4 S AT0.Connect
root 1693 1373 90744 18344 c01f2aa0 afd0b8a4 S AT1.Connect
root 1694 1373 90744 18344 c0192274 afd0c798 S AT2.Connect
root 1695 1373 90744 18344 c0192274 afd0c798 S DUN.Connect
root 1696 1373 90744 18344 c01eb970 afd0b55c S UPNP0.Connect
root 1697 1373 90744 18344 c01eb970 afd0b55c S UPNP0_0.Connect
root 1698 1373 90744 18344 c01f2aa0 afd0c5fc S AIO.Monitor
root 1699 1373 90744 18344 c0192274 afd0c798 S AT2.Write
root 1700 1373 90744 18344 c01f2aa0 afd0b8a4 S AT2.Read
root 1702 1373 90744 18344 c0192274 afd0c798 S HSTI.Write
root 1704 1373 90744 18344 c0192274 afd0c798 S UPNP_BROWSING
root 1705 1373 90744 18344 c0192274 afd0c798 S UPNP_DOWNLOAD
root 1706 1373 90744 18344 c0192274 afd0c798 S UPNP_CONTROLLER
root 1710 1373 90744 18344 c0192274 afd0c798 S HSTI.Write
root 1711 1373 90744 18344 c0192274 afd0c798 S Decoder
root 1712 1373 90744 18344 c0192274 afd0c798 S UPnP_TxTP
root 1713 1373 90744 18344 c0192274 afd0c798 S MMP_Resampling_
root 1715 1373 90744 18344 c0192274 afd0c798 S MMP_Sad_Filter
root 1716 1373 90744 18344 c0192274 afd0c798 S MMP_Update_EQ_c
root 1717 1373 90744 18344 c0192274 afd0c798 S Equalizer
root 1721 1373 90744 18344 c0192274 afd0c798 S VB2 update thre
root 1722 1373 90744 18344 c0192274 afd0c798 S MMP_VB2_Filter
root 1723 1373 90744 18344 c0192274 afd0c798 S TTS Manager thr
root 1724 1373 90744 18344 c0192274 afd0c798 S SoprAsrFrontEnd
root 1725 1373 90744 18344 c0192274 afd0c798 S SoprAsrBackEnd
root 1726 1373 90744 18344 c0192274 afd0c798 S MMP_CSV2_Filter
root 1727 1373 90744 18344 c0192274 afd0c798 S Memo Recording
root 1732 1373 90744 18344 c0192274 afd0c798 S Playback front
root 1734 1373 90744 18344 c0192274 afd0c798 S Playback backen
root 1738 1373 90744 18344 c0192274 afd0c798 S Concertos_LineI
root 1739 1373 90744 18344 c0192274 afd0c798 S MMP AudioInput
root 1741 1373 90744 18344 c0192274 afd0c798 S MMP AudioInput
root 1742 1373 90744 18344 c0192274 afd0c798 S L2CAP_Sender-0
root 1751 1373 90744 18344 c0192274 afd0c798 S HSTI.Write
root 1752 1373 90744 18344 c0192274 afd0c798 S HSTI.Write
root 1753 1373 90744 18344 c0192274 afd0c798 S Blues_Obex_Work
root 1754 1373 90744 18344 c0192274 afd0c798 S Blues_Obex_Work
root 1755 1373 90744 18344 c0192274 afd0c798 S Blues_Obex_Work
root 1759 1373 90744 18344 c0192274 afd0c798 S Blues_Job_Worke
root 1764 1373 90744 18344 c0192274 afd0c798 S UPnP_TxTP
root 1777 1373 90744 18344 c0192274 afd0c798 S UPnP_TxTP
root 1788 1373 90744 18344 c0192274 afd0c798 S UPnP_TxTP
root 1790 1373 90744 18344 c0192274 afd0c798 S BT PIM I0
root 1798 1373 90744 18344 c01f2aa0 afd0b8a4 S UPnP_RxTP
root 1799 1373 90744 18344 c0192274 afd0c798 S BT PIM I1
root 1801 1373 90744 18344 c0192274 afd0c798 S HSTI.Write
root 1807 1373 90744 18344 c0192274 afd0c798 S BT PIM I2
root 1815 1373 90744 18344 c0192274 afd0c798 S UPnP_RxTP
root 1817 1373 90744 18344 c0192274 afd0c798 S UPnP_RxTP
root 1818 1373 90744 18344 c0192274 afd0c798 S UPnP_RxTP
root 1826 1373 90744 18344 c0192274 afd0c798 S HSTI.Write
root 1865 1373 90744 18344 c0192274 afd0c798 S UPnP_ProfileTP
root 1875 1373 90744 18344 c0192274 afd0c798 S UPnP_ProfileTP
root 1876 1373 90744 18344 c0192274 afd0c798 S UPnP_ProfileTP
root 1877 1373 90744 18344 c0192274 afd0c798 S UPnP_ProfileTP
root 1878 1373 90744 18344 c0192274 afd0c798 S UPnP_TxTP
root 1885 1373 90744 18344 bf0d8814 afd0b77c S Blues_BNEP_Eth
root 1889 1373 90744 18344 c0192274 afd0c798 S UPnP_RxTP
root 1892 1373 90744 18344 c0192274 afd0c798 S UPnP_ProfileTP
root 2078 1373 90744 18344 c0192274 afd0c798 S HSTI.Write
root 3712 1373 90744 18344 c0192274 afd0c798 S UPnP_AdvTP
root 3742 1373 90744 18344 c0192274 afd0c798 S UPnP_AdvTP
root 3848 1373 90744 18344 c0192274 afd0c798 S UPnP_AdvTP
root 4997 1373 90744 18344 c0192274 afd0c798 S UPnP_AdvTP
root 5014 1373 90744 18344 c0192274 afd0c798 S UPnP_AdvTP