Yeah, I played this afternoon and found that setting the recording delay at -120 msec worked well for the ones I tried. I will try this again later while recording to see if the loops line up well with the beat. I am finding it workable...I had taken the approach of tweaking the recording, not the MIDI file, as this seemed much easier to just measure the offset using waveforms and hack that much off the silence before the beat starts (I always create my files with a measure of silence just so I can have a buffer).
Anyway, I have tried almost all of my old recordings and I am not getting this stutter issue. I thought maybe it was just uptempo songs for some reason, as the new songs I did were over 150 bpm, but have tried some older uptempo songs an no problem. I am at a loss, and I hope Arlo can provide some insight. I will continue to troubleshoot on my end. One thing I am definitely seeing is a problem with the Midi Clock on the new songs: my Strymon Mobius pedal displays the bpm for the song, as determined by the MIDI clock. On the old songs, it stays steady, but not the new ones...it will shift during the song.
The song a tired to add this weekend was Message in a Bottle, played at 155 BPM. I play the verse bass line and loop it. Later in the song, I can see the Mobius pedal goes from 155 to maybe 154 or 153, and when the looper is told to play the bass line, it will play, then suddenly stutter and restart from the beginning, but now off tempo. I think one time, on the 3rd verse (after stuttering during 2nd verse), it was back on tempo when it was played again.
This behavior seems consistent and only with songs I have recently added to Bandhelper.