void CommandAudioStartPos()
        {
            switch (CommandBuffer[9] & 0xC0)
            {
            case 0x00:                     // Set start offset in LBA units
                audioStartLBA = (CommandBuffer[3] << 16) | (CommandBuffer[4] << 8) | CommandBuffer[5];
                break;

            case 0x40:                     // Set start offset in absolute MSF units
                byte m = CommandBuffer[2].BCDtoBin();
                byte s = CommandBuffer[3].BCDtoBin();
                byte f = CommandBuffer[4].BCDtoBin();
                audioStartLBA = DiscUtils.Convert_AMSF_To_LBA(m, s, f);
                break;

            case 0x80:                     // Set start offset in track units
                byte trackNo = CommandBuffer[2].BCDtoBin();
                audioStartLBA = disc.Session1.Tracks[trackNo].LBA;
                break;
            }

            if (CommandBuffer[1] == 0)
            {
                pce.CDAudio.PlayStartingAtLba(audioStartLBA);
                pce.CDAudio.Pause();
            }
            else
            {
                pce.CDAudio.PlayStartingAtLba(audioStartLBA);
            }

            SetStatusMessage(STATUS_GOOD, 0);
            pce.IntDataTransferComplete = true;
        }
        void CommandAudioEndPos()
        {
            switch (CommandBuffer[9] & 0xC0)
            {
            case 0x00:                     // Set end offset in LBA units
                audioEndLBA = (CommandBuffer[3] << 16) | (CommandBuffer[4] << 8) | CommandBuffer[5];
                break;

            case 0x40:                     // Set end offset in absolute MSF units
                byte m = CommandBuffer[2].BCDtoBin();
                byte s = CommandBuffer[3].BCDtoBin();
                byte f = CommandBuffer[4].BCDtoBin();
                audioEndLBA = DiscUtils.Convert_AMSF_To_LBA(m, s, f);
                break;

            case 0x80:                     // Set end offset in track units
                byte trackNo = CommandBuffer[2].BCDtoBin();
                if (trackNo - 1 >= disc.Session1.Tracks.Count)
                {
                    audioEndLBA = disc.Session1.LeadoutLBA;
                }
                else
                {
                    audioEndLBA = disc.Session1.Tracks[trackNo].LBA;
                }
                break;
            }

            switch (CommandBuffer[1])
            {
            case 0:                     // end immediately
                pce.CDAudio.Stop();
                break;

            case 1:                     // play in loop mode. I guess this constitues A-B looping
                pce.CDAudio.PlayStartingAtLba(audioStartLBA);
                pce.CDAudio.EndLBA   = audioEndLBA;
                pce.CDAudio.PlayMode = CDAudio.PlaybackMode_LoopOnCompletion;
                break;

            case 2:                     // Play audio, fire IRQ2 when end position reached, maybe
                pce.CDAudio.PlayStartingAtLba(audioStartLBA);
                pce.CDAudio.EndLBA   = audioEndLBA;
                pce.CDAudio.PlayMode = CDAudio.PlaybackMode_CallbackOnCompletion;
                break;

            case 3:                     // Play normal
                pce.CDAudio.PlayStartingAtLba(audioStartLBA);
                pce.CDAudio.EndLBA   = audioEndLBA;
                pce.CDAudio.PlayMode = CDAudio.PlaybackMode_StopOnCompletion;
                break;
            }
            SetStatusMessage(STATUS_GOOD, 0);
        }