Step Sequencer 'Fit to n Quarter Notes' bug.

Good idea. Have you put in a feature request?

For what it's worth, my approach to x/8 timings is to use the step sequencer to cover two or more bars rather than one. It possibly helps that the genres I use these timings in generally treat x/8 unusually (in musical theory terms). E.g. a traditional English/Irish/Scots jig is conventionally written down in 6/8 and refered to as being in 6/8, but the strong beats fall on beats 1 and 4, so it's really a kind of "tripletted" 2/4 with three quavers/crotchet, if you see what I mean.

Anyway, I've never worked in 21/8, but I've just tried a basic experiment of setting the timing to 21/8, loading session drummer and the setting step sequencer to 41 beats with "fit to quarters" set to 21. Number of steps per beat step to 1, though it doesn't matter.

After adding some notes I get a 2 bar pattern which on playback stays in time with both a second instance of session drummer programmed via the piano roll and the metronome, so I don't seem to be seeing your tempo problems - though that's a very simple experiment, and I haven't tried a comparison between the MIDI side of things and recorded audio.

The step sequencer is presumably intended to emulate the kind of "old-fashioned" sequencers found in hardware (though it's more capable than most), and like them has limitations and calls for sometimes awkward work-arounds, especially with more "unusual" time signatures. Being able to tell it to fit to 1/8 or 1/16 rather than just 1/4 would certainly make life easier

1. Agree absolutely.

2. I'm with you now  - I must have been having a particularly stupid day yesterday. Yes, it looks like a bug and I can reproduce it.

These bugs have made it into X2 as well :-(

Time to lodge an X2 bug report I think.