MS-10 trigger/gate inverse?

Discussion and support for MOTU's Volta software.

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lagezon
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MS-10 trigger/gate inverse?

Post by lagezon » Wed Feb 17, 2010 4:25 pm

It appears that the Volta gate/trigger is inverted to what my MS-10 is expecting.

Using the an envelope to the "intial gain" works but means i can't use the internal ADSR.

I've tried 2 cable configurations. TRS-TRS with floating ring and TRS-TS connecting tip-tip and ring-shield without a difference.

any tips?

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haiku-ish
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Post by haiku-ish » Wed Feb 17, 2010 4:55 pm


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1nput0utput
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Post by 1nput0utput » Wed Feb 17, 2010 5:48 pm

That's the same circuit as in the Micromoog manual (except with another TS plug in place of the Cinch Jones plug).
Image

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os
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Post by os » Thu Feb 18, 2010 9:52 am

Alternatively just flip the signal after it leaves Volta, in your DAW.

A generic phase inversion plug-in (most DAWs have one) is what you want.

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1nput0utput
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Post by 1nput0utput » Thu Feb 18, 2010 12:32 pm

os wrote:Alternatively just flip the signal after it leaves Volta, in your DAW.

A generic phase inversion plug-in (most DAWs have one) is what you want.
No, that won't work. A v-trigger signal such as what is generated by Volta maintains 0 VDC in the off state and maximum positive voltage (varies depending upon which interface output you're using) in the on state. Simply inverting that signal would still maintain 0 VDC when the trigger is off, and the inverted on state would be maximum negative voltage.

So, for a given audio interface output, the typical trigger would be 0 VDC when off and +4 VDC when on. Inverting that signal would produce 0 VDC when off and -4 VDC when on.

That is not an s-trigger signal. S-trigger must maintain a high positive DC voltage in the off state and short to ground in the on state. For instance, it would be +7 VDC in the off state and 0 VDC in the on state.

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os
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Post by os » Thu Feb 18, 2010 2:09 pm

Fair point. The solution then is to invert it and then add a DC offset, which can still be accomplished in the DAW, without fancy cables.

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