Hi,
Are you using APC40 or APC40 MKII? The APC40 (original) init sequence is different.
Also, make sure you don't have another application holding the APC40 port open. Some DAW's (like Ableton Live) try to access the port directly so it is better you start up MT Pro first to ensure it has access to the port, then in the DAW, select a Bome Virtual Port instead of the actual device port.
APC40 (1st gen) F0 47 7F 73 60 00 04 41 08 01 01 F7
APC20 F0 47 7F 7B 60 00 04 41 08 02 01 F7
APC Key 25 F0 47 7F 27 60 00 04 41 08 02 01 F7
APC40 MK2 F0 47 7f 29 60 00 04 42 09 07 01 f7
Modes
0x40 Generic (Startup Default) Track select Radio- Channel Toggle
0x41 Ableton Live (LED Ring Remote Controlled) Momentary All
0x42 Alternate Ableton Live Momentary All
0x43 Note Mode (APC 20 only)
Notes Regarding Ableton Live Mode (Mode 1):
- All buttons are momentary buttons.
- Device control knobs and buttons are not banked within the APC40 Mk2.
- LED Rings around the knobs are controlled by the APC40 but can be updated by the Host.
- All other LEDs are controlled by the Host.
Notes Regarding Alternate Ableton Live Mode (Mode 2):
- All buttons are momentary buttons.
- Device control knobs and buttons are not banked within the APC40 Mk2.
- All LEDs are controlled by the Host.