Your Phone Is the Slide.
Push it away and the pitch drops. Pull it back and the pitch rises. Open your mouth and it plays. Close it and it stops.
𝄢 F3
4th position · in tune
How It Works
The front camera measures how far the phone is from your face. That distance becomes the slide. There is nothing to blow into and nothing to plug in.
Hold It Up
Hold your phone in front of you, screen facing you. The front camera reads the distance between the phone and your face.
Work the Slide
Push away and the pitch drops. Pull back and it rises. All seven positions, from 1st close to your face to 7th at arm's length.
Open Your Mouth
Open it to play. Close it to stop. Or hold the pad on the screen instead. Your choice.
Free, and Yours to Keep
No account. No ads. No subscription.
- The slide: all seven positions, 1st through 7th
- Your mouth: open to play, close to stop
- Seven partials, B♭2 up to B♭4, chosen with your thumb
- A buzzy brass tone, rich in harmonics
- The name of every note you play
- A three-step guide that fits the slide to your arm
Slide positions
Close = high · Far = low
The Full Instrument
One purchase adds the rest. No subscription, ever.
Wah
Brass that speaks. Your mouth works like a plunger mute — mouthing "wah" says it. Slide out a position on each one and you have the sad trombone.
Pure
A simple mellow trombone sound, for hearing the pitch and nothing else.
Lips
Let your mouth choose the partial, the way a brass player's lips do. A small opening for the high notes, a wide one for the low. No hands.
Assist & Snap
Help with intonation. Assist draws you gently toward each position. Snap lands on it exactly.
The Staff
Every note written on a bass staff as you play it, ledger lines and all, with how many cents sharp or flat you are.
Solfège
Note names as Do, Re, Mi in place of C, D, E. The app picks the one used where you live, and you can change it at any time.
Good to Know
An Instrument of Its Own.
The sound is made in the app as you play. Not a recording of a trombone — a trombone of a different kind.
Unlock everything for $1.99 — one purchase, once.
Part of the unlock — the staff shows every note as you play it
Live bass staff
B♭2
Ledger lines, cents sharp/flat, and the note name — all as you play