As a follow up to my own message:
I though I would try try another approach to allowing mixing reads from seaparte primer-pairs in a single pregap4 mutation detection session.
I thought I would create a simple text database holding my WT (wildtype trace) and RS (reference sequence) values.
But, lo, through WT appears as a 'LINE TYPE' when I choose to 'ADD COLUMN', 'RS' does not!
Am I missing something, or is the Staden code?
Or, if you think my whole eterprise is misguided in the first place, I'd be happy to hear your thoughts too...