Abnormal MIDI Instrument Track Latency

[Cayce]

I’ve been having problems with a MIDI drum track for several days now. While recording, low latency monitoring and delay compensation are both off. Buffer size is 512 and I’m running no plugins. I’m using Superior Drummer with all drum instruments/mics routed to separate tracks in PT, a standard setup I’ve used for years with no issues. I record the MIDI track with a Yamaha CP40, get a great playback, quantize, and I'm off to work on other audio tracks. But as soon as I disengage the record button on the MIDI drum track, there’s a latency of about 300 ticks applied to the playback. That’s just about a third of a beat of latency just for releasing the record button, throwing everything off.

To correct this I have to engage the Delay Compensation, putting the MIDI track back in sync. When I do that, though, any other track I try and record on has the same amount of latency applied to the input signal, no matter what my buffer setting, or whether low latency monitoring is engaged. My input signal is delayed by the same 300 ticks.

Today I upgraded from 2018.7 to 2019.6 hoping that would solve the problem but it didn't. My project is on hold until I can get this worked out, and I'm under a deadline. Any help would be appreciated.

Thanks.

Pro Tools 2019.6
iMac (Retina 5K, 27-inch, Late 2015)
4 GHz Intel Core i7
32 GB 1867 MHz DDR3
3 External Monitors: 27", 24" & 65"

[albee1952]

Grasping at straws, but.....You say there are no plugins except Superior Drummer....Are there any sends in use? If so, make sure that each send actually goes somewhere. Every time I have had oddball latency, it turned out that I had a send on a track(any track in the session) that had no destination. This caused a bit over 1900 samples of bogus ADC. Fast way to check; make all sends inactive and test

[Cayce]

Hey, Albee;

It's ok to be grasping at straws... been there a while, myself. No straw left behind.

There aren't any sends in play. What I've further done in troubleshooting is totally disengaged/muted the Instrument input on the track and physically unplugged the CP40 from the system, so whatever it’s doing, it’s doing within Pro Tools, seems to me.

Puzzled and behind schedule...

[albee1952]

Hmmm, a buffer of 512 would never work for me. I do all tracking at the 64 setting.