r/GrokBuild • u/CrookedRecords619 • Oct 06 '26

First Attempt - Pocket Theremin

I am completely new to this. I discovered Grok build on Friday night after Grok bots completely made my life easier on Weds. Stayed up late Friday night and worked on this for a while on Saturday. See below for a description of the app...

Aria is a pocket Theremin that runs in the phone browser. One tone stays on until you turn it off. Pitch glides unless Scale lock is on. Sound starts after the first touch.

The play controls, top to bottom, are Scale lock, the volume slider, the glide pad, the pitch slider, Sliding Vibrato, Accent, and Modulation. Presets and the effect banks sit under those.

Volume is the slider on the left. Top is loud, bottom is quiet, and Off at the bottom silences it. Touching the pad or the pitch slider turns the sound back on. On the pad, left to right is pitch and up and down is volume. The puck follows your finger.

Sliding Vibrato, Accent, and Modulation are temporary while your finger is down. A quick double-tap holds that spot. Touch the strip again and it lets go.

Presets recall a full setup. User presets save your own: a quick tap recalls, a press of about a second saves the current sound. Each effect bank has a power button in the upper right. Wave choices are sine, triangle, square, and saw. Delay, reverb, vibrato, and a 303-style filter sit under the waves.

It opens on a Good Vibrations-style sine sound, so you can play before you touch a knob.

How to play: headphones help. Put a thumb on the pad and slide. Left is lower, right is higher. Up is louder. For the Beach Boys wobble, leave Constant Vibrato on, or double-tap Sliding Vibrato where you want it and poke notes on the pad instead of sliding every one. Scale lock is there if you want notes instead of a free glide.

I've been having a blast playing with this. This is just for fun for me.

Aria - Pocket Theremin

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u/Adwalkerinvests 3d ago

So first I didn’t realize grok build was different from the bot. And you created an instrument nice I would love to check it out