I have an iHP-120 which I use to record when I want the *best* results (via the optical in+.WAV). My H340 is used in most other circumstances, and seeing as there's not much difference between the '780 and the '340 in terms of recording options, I would hope my advice is pretty accurate;
Teacher's examples - 96-128KBpS
FM Broadcast (I assume you mean recording?) 128-320KBpS
Line in from Portable CDP - 192KBpS
Line in from Cassette tape - Highest bitrate (in this case 320KBpS)
Café performance - 160-192KBpS
For those I've left as variables, it's simply your decision as to which bitrate you feel comfortable working with. Personally, I record FM Broadcasts @ 320KBpS because it's what the player was already set up to do when I bought the unit - however, I've been meaning to scale it down to 128KBpS, solely because I now only use it to record songs for future reference (read; d/l later
) ...
HTH,
MU4L