This app acts as a MIDI control surface for iPads, simulating a 31-button diatonic button accordion. It's designed to control external hardware or virtual instruments, offering customizable MIDI settings and a push/pull bellows simulation.
3.4
July 4, 2025
Bug fixex
The Hohner MIDI SqueezeBox is a 31-button, three-row diatonic button accordion CoreMIDI control surface for the iPad. It does not produce sound on its own but is used to control external MIDI synthesizers or virtual instruments.
No, the Hohner MIDI SqueezeBox does not produce any sound by itself. It functions solely as a MIDI control surface to trigger sounds from other hardware or software instruments.
The app is inspired by the Hohner Corona II and uses the GCF (Sol) button layout, which is popular for Tex-Mex, Norteño, Tejano, Conjunto, and Vallenato music styles.
You touch anywhere in the bellows image at the top of the screen for PUSH notes and lift your finger for PULL notes. A PUSH/PULL indicator and side lighting track the bellows direction and motion.
Yes, the app is based on the standard GCF tuning but allows for other tunings by using the transposition control. For example, setting a -2 semitone transposition achieves FBbEb (Fa) tuning.
You can set the instrument's MIDI volume, modulation, channel (1-8), key attack velocity (fixed or variable), velocity min/max, and transposition (+/- 12 semitones).
The latest version, 3.4, was released on July 4, 2025, indicating recent development activity. The app was originally released on July 11, 2011.
Hohner MIDI SqueezeBox is currently supported on iPads. It is rated for ages 4 and up.
