I’m wondering how the tempo makes use of the samples when adjusting for lower or higher bpm. Are the samples themselves stretched to be shorter/longer (w/o change in pitch) depending on tempo, or are they simply triggered at a slower/quicker rate? I’ve noticed that when adding samples longer than a typical percussion hit like a sustained synth chord, it tends to play out the same regardless of tempo, which makes me guess BB works the latter way, but I wanted to check in case there’s a way to have it work by stretching for situations like for the synth.
I think there is a percussion setting for drum set (or individual instrument?) meaning that is the note length affecting the sound or not 
For percussion only the choke group can end the sound in the middle. For non percussion I’d guess it’ll just loop the sample until note length is met, but I actually don’t know 
When a sample is labeled as percussion, the full length of the sample plays. When it is labeled as non-percussion, it plays for the length of the midi note or the length of the sample, whichever is shorter. The samples do not adjust for tempo, nor do they loop to cover the full length of a written note. When notes are part of a choke group, their behavior is altered by the choke group parameters. If a choke group has a polyphony of 1, when the second note of a group is played while the first one is still playing, the first note will cease (it is Choked), abd just the second note plays.
As the BB was designed as a drum machine, it does not function like a synthesizer that allows note to be held for indeterminate length. It does not view notes for their ADSR characteristics (Attack, Decay, Sustain, Release.)
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