The reason I was doing this render was because I was trying to get a stable file to play on the laptop, where I have been all sorts of problems with locking up / bad sound etc.

Think I've found the root cause of this (and several other problems I have been having).

Problems

1.Stuttering, locking up , bad sounds, pops and crackles on realtracks
2.Access violation on ASIO driver
3.Play/render to audio track - drums colour changes and lose them altogether on unrender
4.Several other strange things like panning mix disappearing / getting reset
5.BIAB playing a song but can't be stopped / paused - only solution is stop via task manager

Solution

Don't use ASIO driver for SD-50 - I'm using MME and all my problems seem to have gone away.

Is this is a BIAB problem or a Roland problem?? Any input gratefully received.