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Sat Jan 1 01:21:29 EST 2011

Diode ladder chirps

According to [1], the chirpiness is a well-known feature of the 303,
and in the x0xb0x there's a special transistor SA733P[3] that's
supposed to cause that sound.  Hmm...  Reminds me of fuzz GaAs voodoo.
Apparently[3] it's due to higher current gain, which makes sense.
Also, the warble in the resonnance is caused by power supply
fluctuations.

However the module he's playing (Oakley sound super ladder filter [2])
doesn't have special transistors and has the chirpiness anyway.
Doesn't make a lot of sense.

Another things he mentions is the 1-pole filter on the 303.  What's
that about?  Looks like there are more "varislope" or "variable slope"
filters around.  Check online.


[1] http://www.youtube.com/watch?v=kxiHEJ_24FA
[2] http://www.oakleysound.com/super-d.htm
[3] http://www.ladyada.net/make/x0xb0x/mods.html




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