nebularia - ultima ratio

Current known list of issues with this track:
- [x] Global volume slide is a bit too slow
- [x] Notes tend to fade prematurely around the start (related to #7?)
- [ ] Pads seem to cut out before the lead repeats in harmony
- [x] Stuck note on the cymbal
- [ ] Strings tend to note-cut before the guitar comes in
- [x] Premature fading on the flute when the guitar comes in
- [ ] Synth lead prematurely cuts out, even though the transition to distorted guitar mostly holds (MOSTLY. It breaks later) - could be mixer-related?
- [ ] After all that synth + distgut stuff, strings tend to notecut
- [ ] Lots of stuff cuts out close to the end when it starts winding down
- [ ] Whatever else is discovered.

Current suspect: NNA/DCT new channel allocation may be stealing channels it shouldn't. Upping the channel count from 128 to 256 seems to result in more or less the same crap, so probably not an exhaustion issue.