Molly the Poly

Molly the Poly

Classic polysynth with solar system patch creator.

Video on Instagram

Juno-6 voice structure with chorus, the extra modulation of a Jupiter-8, and CS-80 inspired ring modulation. This isn’t a proper emulation but you can definitely make space sounds.

The included lib should make it easy to use the engine in other scripts. Uses the same engine commands as Passersby for note on/off etc.

Would love to make this MPE-ready if someone has the hardware and can help out…


MIDI or grid note input (eg, keyboard, sequencer, grid)


E1 : Choose a patch planet
E2 : Create a sound

Lots of parameters and modulation to play with!


Molly the Poly v1.1.0
Note that you’ll need to restart after installing an engine.



never mind asked in the help section how to save a preset. Nice synth thank you.

might be good to add a note in documentation to reset/restart norns after installing (to activate the new engine)


Just want to say that Molly was very popular with my niece over Easter weekend. She asked if she could “play with the keyboard thing where you blow up the sun to do new stuff.” :slightly_smiling_face:


Oh wow that’s so cool to hear! Thanks for sharing :blush:

1 Like

Just pushed an update with support for using a grid, Earthsea-style, thanks to @jaredpereira for the contribution!


i really love the sound of this synth engine
how can i seq it from the live? do i have to use a midi-usb converter and connect it to the midi out of my Motu? or is it possible to connect the laptoop directly to norns for sequencing it?

USB to MIDI works (I use the iConnectivity mio). I’m not aware of a way to connect laptop to norns directly, but I know there are a few discussions elsewhere on lines about it.

1 Like

thanks mark, yes, i’m doing the same with iConnectivity, just feels that there should be a direct way to connect it, would be great to do that thru the power mini usb

1 Like

would be great to do that thru the power mini usb

that’s not going to happen. the mini usb on norns is a serial tty port and nothing else.

i’d recommend networking norns and your computer and sending OSC.

or, you know, just running Molly in supercollider on the computer.


Hi @markeats (or anyone else who can help) -

I’m working on a sequencer script using Molly the Polly as the engine, and I’ve noticed some clicks when I have a lot of polyphony going on. I’d like to add a parameter to limit the voices (also for creative reasons), but I’m not super familiar with supercollider.

I see the engine has a maxNumVoices classvar, and I’ve gotten as far as adding this:

this.addCommand(\maxNumVoices, "i", { arg msg;
	maxNumVoices = msg[1];

Which appears to work if I set the param before I call any noteOn commands, but doesn’t work properly when I update it dynamically after. I suspect I would need to add some logic to to the noteOn command which handles removing voices, but I’m a little lost on where to proceed.

Any suggestions would be much appreciated!

When you say clicks do you mean when voices are stolen (ie, new notes started)? Or more like crackling audio dropouts while notes are just held?

I’d be inclined to keep the maxNumVoices a fixed constant that should be based on the max norns performance (it should already be but we’ve had a few updates since I last tested) and if it’s just about creative intent then limit the voices in the lua script.

It seems to happen when new notes are started. I haven’t tried to reproduce it in your Molly the Polly lua script, though. It’s possible I’m doing something else funky in my script that’s causing performance issues.

Totally understood if you’d prefer to keep it a fixed constant. My first instinct was to put this in the engine, but I would probably have an easier time implementing it in Lua anyway :slight_smile:

I’m just thinking if the clicks are to do with voice start / stop then reducing the count won’t fix it – it may need a little investigating. If you can reproduce it in a simple script or the included one then I can look into it.

This looks so cool! Do you have any videos of this being used?

1 Like

Just the one at the top from me, you might find some from others on Instagram though.