Is anyone round here doing anything with iBus (i.e replacing CDChangers)?

I have been decoding some of the iBus packets... To look at replacing a (broken) cd changer with a raspberry pi... But I'm stuck today on a packet that comes in with the sequence

src 0x68 len 0x05 dst 0x18 0x38 0x02 0000 0x4f Checksum OK

i.e. [0x68 0x05 0x18 0x38 0x02 0x00 0x4f]

So it LOOKS like a command from the Radio (0x68) to the CD (0x18) to do something with the CD (0x38)... but the parameter 0x02 seems to be undocumented anywhere around that I can find... e..g 0x38 0x00 is a request for status. 0x38 0x01 is stop playing. 0x38 0x03 is start playing... But what's 0x38 0x02? Anyone known?




H