0x4_ atoms in AC7 - michgz/ac7maker Wiki

0x40: System reverb type

40 01 rr Reverb type

0x41: System chorus type

41 01 cc Chorus type

0x42: System delay type

42 01 dd Delay type

0x46: System reverb individual parameters

46 02 00 vv Same as 40 01 vv
46 02 01 vv Reverb time
46 02 02 vv TBD
46 02 03 vv TBD
46 02 04 vv TBD
46 02 05 vv Reverb send return

0x47: System chorus parameters

47 02 00 vv Same as 41 01 vv
47 02 01 vv LFO Rate
47 02 02 vv LFO Depth
47 02 03 vv TBD
47 02 04 vv TBD
47 02 05 vv TBD
47 02 06 vv Chorus send to Reverb
47 02 07 vv Chorus send to Delay
47 02 08 vv Chorus send return

0x48: System delay parameters

48 02 00 vv Same as 42 01 vv
48 03 01 uu vv Delay Time (100*uu + vv, units of approx. 0.30 milliseconds. Maximum 2972)
48 02 02 vv Delay decay rate
48 02 03 vv Delay high damp
48 02 04 vv Delay L time ratio
48 02 05 vv Delay feedback
48 02 06 vv Delay R time ratio
48 02 07 vv Delay L channel amplitude
48 02 08 vv Delay stereo center amplitude
48 02 09 vv Delay R channel amplitude
48 02 0A vv TBD
48 02 0B vv Delay send to Reverb
48 02 0C vv Delay send return

0x45: System delay parameters (2)

45 01 vv Same as 48 02 0B vv