Non-volatile (=storable) tap-tempo/manual-control delay

Tim Kleinert

Hi,

Yesterday my last G2X left the building. Quite a moment...

Nevertheless, as mentioned in previous posts in this sub-section, I'm scouring my personal patches and extracting any sub-circuits that might be of interest or use to anyone.

The objective of this building block is to equip a delay-effect both with tap-tempo functionality that is non-volatile (meaning that the tapped tempo remains stored in the variation/patch) and manual control. So when you tap a new delay time, the manual control changes accordingly. Also, the manual control should be smoothed (glitch-less), but tapped delay values should snap immediately in order to not generate any "warbles".

One method to do this would be via MIDI CC# modules and accordingly assigned knobs (sending the tapped value as a MIDI CC# to the delay time knob). But this method has a serious drawback, as the CC#-send modules lack a "this slot" option, meaning that one would have to modify the patch each time it is loaded into another slot, which is unpractical and confusing.

This building-block "abuses" Laughing

the note recording feature of the NoteSequencer module as a non-volatile value storage device. The corresponding note value knob neatly also provides manual control. The value display will be nonsensical (in form of note pitches), but in this kind of scenario delay time adjustment is done by ear anyway, with the LED-collar serving as a rough visual guide.

It is designed to control a 1 second delay line. The first tap on the button is taken as the start reference, and the second tap will define the delay length. Any further taps after that, that occur within one second, will again be taken as the length (without averaging). After a second, the circuit again goes into "waiting mode" and will take the first tap as the start reference.

The controlled delay will discretely jump to new tapped values. Manual control however is smoothed (adjustable) as to prevent the cascade of crackles that occurs when sweeping wide ranges without this precaution.

The delay time value output is bipolar -see how to set and connect a 1s delay line correctly in the demo circuit. Of course, you can add a LevelConverter module and do this in a more straightforward way, but I wanted to keep it as economical as possbile because of the ~~f*cking irrit~~cough zeropage memory limits.

DSP usage: 4.1% cycles, 10.9% memory (just the control section without a 1s delay module)

Prepared for publication using the demo software.

cheers,
t

StoreTapTemDlyTK.pch2

Description:

Control-circuit for 1s delay module, offering non-volatile (=storable) delay tap-tempo as well as smooth manual control.

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StoreTapTemDlyTK.pch2

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