breath controller schematics

[Jeremy Brookes]

>> 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 mod
>I don't know what boxes you are talking about. My BC-input belongs to a
>DX-11 synth. The BC controller information (controller 2) can be routed
>independently from that of the modwheel (controller 1) to several  -not
>all the same as for MW- modulation sensitive made parameters (such as the
>envelope bias per operator). If your synth box reacts like giving some
>extra modulation source of the same parameter, the routing of controller
>1 and 2 are both set to a lfo, but this lfo's sensitivity is set to
>different values for BC / MW. But you are free too choose an other
>parameter to be influenced by the BC.


Apologies for any confusion I've caused here. What I was trying to get at
was the fact that the Breath Controller is parallel to the Mod Controller.
it can control the same parameters though with different sensitivity. This
means you could test the control you want with the Mod Controller and then
use the BC to do the same. I think I was trying to avaoid confusion that you
could do something with the Breath Controller that couldn't be done with the
Mod Controller - it's just the same thing really.

>> 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.
>Is this safe to do? I really are almost a witnit on electronics, reading
>most of your messages with touting ears all the time.

I've not tried it myself but have seen something somewhere on the web where
this was done. In fact I think the guy was charging 10 dollars for a box
with a pot, a knob, a lead and a jack plug! It might be possible to identify
which pin is which on the Breath Controller input with a multimeter. If I
get chance I might try and work it out on my old 4-op (YS100) but I'm away
for a few days and won't be able to do it until next week.

Incidentally, there's an editor for 4-op FM synths at my home page along
with some patches - these are just SysEx files renamed to *.YA1

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