I have a 6.4 Z2 I'm trying to use for deck speakers. The on/off works perfect for every ir set I've used. The volume will not go! I've tried more than a dozen codes and none will do volume. I've searched the menu for a fixed/variable level on Z2 or something. All I see is the IR set to Main/Zone2. And no matter which way I select it, it still will not control volume on z2. The AVR works fine other than that.
Any Ideas? I'm using ir code sets via Procontrol Prolink.

IR or RS232? You are in the RS232 subforum, but mentioned IR.

Integra RS232 protocol has hardly changed in 11 years. There were some small changes to the IR protocol around the .3/.4 then some others around .6. Interesting your codes don't work.

ISCP_AVR_128 (8-12-14)

DTR 6.4

Z2 Vol +

!ZVLUP

Z2 Vol -

!ZVLDOWN

IR_AVR_132 (and previous) (8-12-14)

does not list IR Zone 2 commands available for DTR6.4. Additional DB checks don't show IR commands for z2 until DTR-6.5