AW: breath controller schematics

[Jeremy Brookes]

>> Unfortunately not - well, fortunately for me I found that I didn't really
>> need it, because the VL7 already has such a lot of controllers.
>> ( 2 pedal CVs, 2 pedal switches, 3 wheels, Aftertouch, Velocity,
>> the Breath Controller).
>> 
>> As for Yamaha: a request for a service maual for one synth that
>> uses the BC might be more sucessful than a specific question.
>>
>By the way, dous somebody know if Yamaha expanders like TG77
>react on breathcontrol midi data? I have no such controller,
>but could find out how to emulate this. These fm boxes have 
>only few controllers, so one more is much more.

On the old Yamaha FM boxes (4-operator stuff at least), the Breath Controller wasn't really a separate controller. It's value was added to the value of the modulation controller. You could alter the sensitivity of each and alter the sensitivity of some parameters to each. Anything that the Breath Controller could do, you could do with the Modulation Controller, all it does is give you a second source of control.

The BC input on the 4-ops could be controlled by a pot. It's 3 pins, one at 5V, one at 0V, a pot across these with a wiper to the remaining pin.

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