Payback v2.0 Feature Requests

[The Tone God]

Hey everyone.

I'm just starting to put Payback v2.0 through it's paces. I was wondering if there are any particular feature requests that people are looking for. Speak up now.

Andrew

[Morocotopo]

Easily obtainable chip. Ideally, non SMD.

Ha!

Ok, never made the original, but...

- One switch initiates record, one stomp starts, one stomp stops. Another switch initiates playback, one stomp starts, one stomp stops. Another switch (not stomp) toggles between loop and one shot playing. The play switch can go directly from record to play immediately. Does it make sense? So, let´s say, I´m recording, and when I stomp on the play switch, it starts playing immediately.
- Variable speed, reverse playback: nice but not essential to me.
- Status LED´s for the functions.
- Not totally lo-fi
- Maybe a simple lowpass knob. Or some way to control tone of the loop.

Er, that´s as far as my imagination goes. Never owned or used a looper...

[alparent]

Yes...Finally....No special requests.....just a chip I can get!

[The Tone God]

It uses the ISD1700 which can be had easily and is cheap. There will be one part needed that will be made availible through the DIYStompboxes store. The controller which replaces all the discreet logic. The circuit will be very simple to wire up.

The behaviour is similar to the original versions (i.e. 1400 and 2500). One switch for bypass/playback and one switch for record. You can record in bypass if you set it up as such. If you hit the record during playback it will interrupt the playback and start recording, when done it will return to playback of the new loop if still bypass is still engaged. There is a safe switch for the record. There is a playback LED and record LED which in playback blinks when it reaches the end of the loop and starts again much like the 1400 and 2500 did. The fidelity is adjustable and will go as high as is availible in any of the ISD series or as low as the older versions. This can be adjusted on the fly for pitch changing. There is a tone knob just like the other versions. Also there is vibrato with speed and depth.

One shot is hard to do as it would require bypass signal manipulation. I'll look into it. Reverse is not possible.

Andrew

[maarten]

Maybe an option to change over to a second chip, for a change in chord progression when you push a footswitch - that's what I always wanted on the 1.2 (?) version I made. The time interval on that chip was a bit short, and slowing it down will give you less good sound quality. When triggered, at the end of the playback session the next chip would start playing back, and at the end giving over to chip 1 again (or to a third chip?).

I'll be looking forward to the new version - and thanks for the previous one!

Maarten.

[~arph]

Yeah,

I always wanted to hear what this sounds like:

While playing into it, record slices and play them shuffled, while adding new slices and removing the old ones, of course this wil cause a delay in response, but as we are shuffling anyway this is part of the effect. Then one knob to control slice length. (which acts as a sort of speed control)

[aziltz]

EPIC!  No special requests, just excited to see this!

[Strategy]

I was working on a Payback 1.0 and wondered how possible it would be to add an auxiliary record/play feature via voltage control. When voltage goes high over say 2.5-5V it triggers record and when it goes low again it plays. I think to implement this I'd have to use a zener diode or something else to protect the logic from overvoltage.

You may be asking why this is a good idea but say for example you wanted to havea rhythmic record/play process going, you could have an LFO sent out from a Moogerfooger type pedal (Ring Modulator has an LFO output for instance) or modular synthesizer -- telling the Payback when to 'grab' parts of your riff. It could provide for some interesting/abstract 'automating' possibilities.

This is probably a pretty obscure feature for most casual users, but I like my pedals patchable!

Strategy

[The Tone God]

Yes this is happening...finally!

Ok so multiple samples maybe possible but I think with the size of the microcontroller being 14-pin I don't have enough I/O to do that. Maybe a upgraded version later depending on response. Right now I'm more focused on getting the basic Payback functionality available (record, playback, vibrato, low power, small size, etc.) so people can build simple compact versions again.

Voltage trigger is something I had on my list but for a different reason. I wanted to be able to do the "auto" trigger that some loopers have which start recording when the signal level got high enough. I can just set it so that it triggers at a 5v level so it can be controlled using logic too. People can then just wire the trigger pin to 5v and it will defeat the trigger. This should be easy to impliment.

Andrew

[Strategy]

Andrew I don't want to bug you with minutia but can you recommend whether or not the 5v wiring (if I try this on my Payback 1.0) should have input protection? Some modular synth gear goes just to 5v but other stuff goes higher so is there a simple convention to protect the internal logic from outside spikes?

Strategy

Yes this is happening...finally!

Ok so multiple samples maybe possible but I think with the size of the microcontroller being 14-pin I don't have enough I/O to do that. Maybe a upgraded version later depending on response. Right now I'm more focused on getting the basic Payback functionality available (record, playback, vibrato, low power, small size, etc.) so people can build simple compact versions again.

Voltage trigger is something I had on my list but for a different reason. I wanted to be able to do the "auto" trigger that some loopers have which start recording when the signal level got high enough. I can just set it so that it triggers at a 5v level so it can be controlled using logic too. People can then just wire the trigger pin to 5v and it will defeat the trigger. This should be easy to impliment.

Andrew

[Valoosj]

Count me in to make a pcb layout!

[frequencycentral]

Subscribed. So how long do we have to wait?

[The Tone God]

Andrew I don't want to bug you with minutia but can you recommend whether or not the 5v wiring (if I try this on my Payback 1.0) should have input protection? Some modular synth gear goes just to 5v but other stuff goes higher so is there a simple convention to protect the internal logic from outside spikes?

I would use some sort of level translator. Some logic gate families can perform this function but there are other ways too. Do a quick google and you will get lots of info.

Subscribed. So how long do we have to wait?

I'm right now in a middle of a few things but really I just have some testing to do for final tweaks and hopefully no big issues will crop up. After that is documentation which is my favourite thing.

Andrew

[culturejam]

Sweet. This ought to be awesome.

[jacobyjd]

I don't know much about what it would take to do this, but is reverse playback even remotely a possibility?

[Taylor]

I don't know much about what it would take to do this, but is reverse playback even remotely a possibility?

Reverse is not possible.

The limitation is the hard-wired nature of the recorder chip. You'd have to get inside the chip and change the clock circuit to make it step backwards through the stages.

[jacobyjd]

Ah, ok--I missed when it was mentioned before--thanks, Taylor.

[p_wats]

Very interested in this project!

[El Heisenberg]

ooo O o OOOO!


GIMME GIMME GIMME

[Skruffyhound]

Subscribing for updates. Looking forward to this Andrew