So, basically I've been playing around with my 2399 for a couple months, but I still haven't figured things out.
I understand how BBD and tape delays work, and digital delays. My question is, what can you do with the external components to 'mod' this chip?
For instance: The caps hooked up to the "MOD" and "DEMOD" modules (pins 7 &

. What are their function, and can increasing or decreasing them do anything useful, or balance other modifications?
The input and output filters: can you just use the LPF's as unity gain buffers and use external filters pre and post? I see you should, at least on the output, use about any filter topology you want. If you added external OPAmps for steeper filtering with the internal amps, would it be better to use a fet input TL0xx, or tranny input, or would it matter?
OP1 & 2 (pins 9-12). I see people using different caps here. Stock calls for .1 in the "surround/delay", but .082 for the "echo" application. What do these do? All I can really get is something to do with bandwidth. Are these just for filtering aliasing out of the output signal? If I'm using bass guitar, could I bump these up to something like .22 (half frequency) for some super-filtering for loooong delay times? (did I just figure this out while I typed by chance?)
I'm not gonna even ask about pins 1-6. It's either obvious, or plenty of topics on them.
Thanks a bunch, if anyone has any answers

Oh yeah, anyone figure out what the longest delay you can squeeze out of this thing before it glitches is? I came across a thread somewhere about the minimum safest delay time (or pin resistance to ground, maybe?) but I can't find anything even closely linked to it now. Read one thread about getting 4 seconds (!!!), but then the chip would shut down for a couple minutes. I figure I'll use no more than half a second or so, but it would be good info to have, since we know the max clock speed.