MOTM

>I use my 320 LFOs as oscillators.  Just throw a CV at 'em and they'll 
>play virtually any frequency I want.
>
>Coupla' questions:
>
>1.- can I hurt the "bipolar" LED by running it at a high frequency 
>for a long time?

No.

>
>2.- the 320 front panel is shockingly bare and virtually begs for
>some sexy mods.  Has anyone tweaked their 320 to get the frequency up?
>

Yes. You can add inverted outputs, a pot for attenuating shape CV, 
and a switch to knock the whole thing up into the audio range:

http://www.tellun.com/motm/diy/db320/DB-320.html

It's Larry's idea, I just did a PCB for it. This DB-320 PCB is 
obsolete but you can recreate it with a MUUB-4 PCB:

http://www.tellun.com/motm/diy/muub/muub.html