Hi,
As last time this is completely untested. This builds and sends the command in steps which means that there will be some delay between the "preamble", "command" and "postamble". I don't know how tight the timing has to be so doing it this way may or may not work.
Code:
'****************************************************************
'*  Name    : Fratello_JVC.pbp                                  *
'*  Author  : Henrik Olsson                                     *
'*  Notice  :                                                   *
'*          :                                                   *
'*  Date    : 2012-03-12                                        *
'*  Version : 1.0                                               *
'*  Notes   :                                                   *
'*          :                                                   *
'****************************************************************
i VAR BYTE
j VAR BYTE
OutBuffer VAR BYTE[8]
BitsToSend VAR BYTE


Main:
    For j = 0 to 10
        GOSUB VolUp
        Pause 1000
    NEXT

    FOR j = 0 to 10
        GOSUB VolDn
        PAUSE 1000
    NEXT
GOTO Main


SendPreamble:
' 00000000  00000000  11111111  01110111 01110111 01010101  11
' Each individual byte reversed:
    OutBuffer[0] = %00000000
    OutBuffer[1] = %00000000
    OutBuffer[2] = %11111111
    OutBuffer[3] = %11101110
    OutBuffer[4] = %11101110
    OutBuffer[5] = %10101010
    OutBuffer[6] = %00000011

    BitsToSend = 50
    
    GOSUB SendBits
RETURN

'-----------------------------------------------------------------------
SendPostAmble:
' 01111111 11111111 11111111 11111111 11110111 01110111 01110101 010111
    OutBuffer[0] = %11111110
    OutBuffer[1] = %11111111
    OutBuffer[2] = %11111111
    OutBuffer[3] = %11111111
    OutBuffer[4] = %11101111
    OutBuffer[5] = %11101110
    OutBuffer[6] = %10101110
    OutBuffer[7] = %00111010
    
    BitsToSend = 54
    
    GOSUB SendBits
RETURN
'-----------------------------------------------------------------------
'-----------------------------------------------------------------------
VolUp:
    GOSUB SendPreAmble
    ' 01010111 10101010 1
    ' Each individual byte reversed
    OutBuffer[0] = %11101010
    OutBuffer[1] = %01010101
    OutBuffer[2] = %00000001
    
    BitsToSend = 17
    
    GOSUB SendBits
    GOSUB SendPostAmble
RETURN
'-----------------------------------------------------------------------
'-----------------------------------------------------------------------
VolDn:
    GOSUB SendPreAmble
    ' 01111010 11110101 0101
    ' Each individual byte reversed
    OutBuffer[0] = %01011110
    OutBuffer[1] = %10101111
    OutBuffer[2] = %00001010
    
    BitsToSend = 20
    GOSUB SendBits
    GOSUB SendPostAmble
RETURN
'-----------------------------------------------------------------------
'-----------------------------------------------------------------------
SendBits:
    BitsToSend = BitsToSend - 1
    For i = 0 to BitsToSend 
        PortB.0 = OutBuffer.0[i]
        PauseUs 536
    NEXT
RETURN
'-----------------------------------------------------------------------
Again, not tested so take it for what it is.

/Henrik.