CV gate that closes and opens tempo synced

[artotaku]

Hello CV-Experts,

I´m scratching around my head for a while on how to do this:
I want a gate/velocity signal where the gate signal closes and opens tempo synced after a button/control is pressed.
The time between closing and reopening the gate should be as short as possible.
Kind of a tempo synced trigger.
I would like to do this preferrably with Reason stock devices e. g. Thor or Matrix or a free RE.
If there is a non-free utility RE that can do this easily, I´m also interested.

Scenario:
1. Gate is open
2. if a button is pressed, the gate signal closes right before a full bar is reached and opens immediately when next bar begins.

Code: Select all

Time ->
1           2           3    (bar)
__________   __________ CV high 
     |    | |
     |    |_|           CV lo (gate closed)
     |
     ^button pressed

Thanks.

[challism]

If I understand you correctly, this should work. If you need the on/off reversed, you can move the CV out from the splitter/spider from the invert out to the regular out.

Devices used:
Combinator
Subtractor (for LFO signal)
CV Spider/Merger
Pongasoft A/B Switch (free RE)
Alligator
Scope Jr (free RE... to show the signal)

EDIT: The LFO is your input source for the gate/rate. You can change the device to any other LFO that you choose... perhaps Little LFO (another free RE) would be better to increase the sync time beyond 1/32, which is Subtractors fastest setting.

The "CV thru" hookup on the back of Scope Jr will be your output for this setup.

CV SWITCH.zip

(2.45 KiB) Downloaded 30 times

[challism]

Here's one using Little LFO. I have the 1st LFO hooked up to the Alligator and the 2nd LFO hooked up to auto-control the on/off switch.

[artotaku]

Thanks Challism, will try this out.

Right after writing my post I found another solution, which I´m testing right now.
It´s one Thor where the sequencer is set to Run Mode "One-Shot" and 1 step. The step generates a velocity/gate signal of length 1 % which is then feed into Thor via "CV1 in" and then subtracted from a constant CV signal in the Mod Matrix. That way I get a time synced short gate close/open signal which can be triggered by Thor´s Run button. Only downside is that the gate closing might be right at the beginning of a bar and not slightly before.

[challism]

I'm not sure exactly what you are trying to do, but hopefully you can modify mine (or the Thor option that you spoke of) to get the result you want.

[Joerg]

Actually its not so difficult and your last approach is the right way.

You only need a Combinator with an RPG-8, a Thor and your sound device (i.e. Malström).

1) Switch Receive Midi off for both Thor and Malström but Receive Midi On for RPG-8 in combinators programmer
2) Switch off the RPG-8 on its front panel, so its not working but just translating the combinators midi input to Note and Gate informations
3) Connect Note out of RPG-8 directly to Note in of Malström
4) Connect Gate out of RPG-8 to CVin1 of Thor
5) Connect CVout1 of Thor to Gate in of Malström
6) set Thors sequencer to Repeat mode, 1 step, speed 4/4 synched, note lenght 98% (and press run)
7) in Thors programmer set CVin1 -> 100 -> CVout1 ->100 -> SeqGate

So the Sequencer scales the gate signal to 0 just before the end of the bar and switches it back to On right at count 1 of the next bar.

When you set the note length to lower values, you can pronounce the gate-off-gap at the end of the bar. When you set other time divisions and/or step numbers, you can sync the gap exactly where you want it (if needed).