[sdiy] Top Octave Generators, beehiving and leakage

[dragon.servicing]

Hi,
I think that the background noise on the older organs is called 
Beehiving. some models have worse background noises than others. It 
seems it is quite hard to design an organ that has a low background 
noise. Dc switching ( electronic switching ) on the keyboards ( rather 
than switching the audio directly ) can help as you can then keep the 
audio signals away from other bits of wiring and circuitry.
I think the leakage knob may be to simulate the effect of all the 
different tonewheels being together on a Hammond organ.
( the signal levels from the tonewheel generators are quite small, so 
there may be coupling ? effects between them) .
regards Peter



Dave Manley wrote:
> Roy J. Tellason wrote:
>>
>> I'm thinking of all that background noise I used to hear in some of 
>> those organs I worked on....
>>
>> It's not at the outputs,  but all that stuff going on being picked up 
>> elsewhere,  particularly in any lower-level circuitry that's the problem.
>>
> 
> In pursuit of emulation perfection, The VOCE tone-wheel modules give you 
> a 'Leakage' knob to set the level of all this buzzing crosstalk.
> 
> http://www.voceinc.com/
> 
> -Dave