I wouldn't advise rolling your own tracker in Blitz... just try altering the pitch of an instrumental sample to hear why not.
People have been asking for pattern jumping (which is part of FMOD so, technically at least, comparatively trivial to add... maybe it's a license restriction?) for ages but it never appears. One (wasteful, where shared instruments are concerned) solution is to use multiple mods but, as you'll know, you can't hold mods in waiting in RAM for instantaneous initiation in Blitz; instead you tend to get a pause as the file is loaded in fresh. However it has been suggested that loading all the modules you'll need before starting a level can ensure they're in the cache and thus minimise this glitch - might be a compromise, but it's worth a look at least.
People have been asking for pattern jumping (which is part of FMOD so, technically at least, comparatively trivial to add... maybe it's a license restriction?) for ages but it never appears. One (wasteful, where shared instruments are concerned) solution is to use multiple mods but, as you'll know, you can't hold mods in waiting in RAM for instantaneous initiation in Blitz; instead you tend to get a pause as the file is loaded in fresh. However it has been suggested that loading all the modules you'll need before starting a level can ensure they're in the cache and thus minimise this glitch - might be a compromise, but it's worth a look at least.