For anyone interested ....

Working on this today I realised that there were some (ahem) problems with the patch I posted, so I've fixed those and finished off the patcher so that I can assemble a number of individual aiff files into a single buffer. The samples are first assembled into a buffer which is set to be larger than I'll need (default 20 seconds, but it can of course be changed). The buffer that was used for loading the individual samples is then sized to fit the total length of the new sample and the combined sample copied to that buffer for saving (the [write] command isn't in the patch yet). The next thing to do is to add a coll to keep the start/end points of the various segments in the new file, and save that along with the new sample. (I already have that; it's just not in this patch yet).

Here it is ..