[A6] Re: PWM Humming prob

[Joan Touzet]

Ignore my last email - very nice find!
---
Joan Touzet  |  joant at ieee.org  |  wohali at efnet



2009/8/26 schaltstern <schaltstern at curious-electric.com>:
> good find!
>
> Am 26.08.2009, 10:03 Uhr, schrieb Kevin Walker <indigoskywalker at gmail.com>:
>
>> Hi all,
>>
>> I finally found out what the cause of the PWM humming issue is. As you
>> probably already know, the lfo's and envelopes in the a6 of generated
>> by the cpu. Alesis clock the mod at 100Hz and multiplex it to the
>> various locations. The Engine Optimizer changes the smoothing of the
>> mod, by adjusting the oscillator setting to smooth pwm, the humming
>> noise has gone. This is set on a per program basis, so some sounds
>> need it and some don't... I also read that turning off the background
>> tuning makes a big difference, so I have. The A6 driffs out of tune a
>> little, but once warmed up it is quite stable. These have both
>> resolved the 100hz humming problem and the A6 sounds richer....
>>
>> K
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