This is the user documentation for the Midi Stylophone II project (using “reissue” stylophone with rather than the original analog model). This stylophone is pimped up with

BUTTONS! - Four tactile switches for controlling the mode of the stylophone. These are placed along the left rear edge of the body and I’ll refer to them as A, B, C and D. Button A is the one closest to the left as you face the front of the Stylophone.

FLASHING LIGHTS! - An RGB LED located on the front right edge indicates the current mode.

TILT SENSOR! - An accelerometer detects tilt left to right and front to back and uses these to control MIDI pitch-bend and modulation wheel respectively. This can be enabled and disabled while playing.

SOCKET! - All that MIDI magic has to get out somewhere

## Basic Operation When the Stylophone is powered up (using the regular power switch on the front panel) the MIDI circuit is in standby mode and the LED on the front panel lights in dim red. The MIDI circuit takes a second or two to boot, so there is a delay before the LED comes on. The Stylophone can be played normally through the speaker (don’t forget to turn up the volume so you can hear it).

Pressing any of the buttons A,B,C or D wakes the MIDI circuit up. The LED on the front panel changes colour from dim red, and touching the Stylus to the keypad will send out MIDI notes.

The MIDI circuit can work in parallel with the normal Stylophone sound, so sounds can be coming from the Stylophone speaker while MIDI is being sent. You will probably want to tune the Stylophone to your synth module (using the normal tuning control on the underneath) if you’ll hearing both at the same time.

When the MIDI circuit is out of standby mode, it regularly “polls” the Stylophone keypad and this sound might be audible as “static” on the Stylophone sound (Sorry, not sure what to do about this). Typically you might turn the Stylophone volume control all the way down when playing MIDI and just use your synth sounds.

MIDI notes are always sent on channel #1. Ensure your synth is set up to listen on this channel.

MIDI notes are always sent with a full scale velocity (127). You can mess with the mod wheel settings to get some dynamics via the tilt sensor.

The Stylophone keyboard has 20 notes (1.5 octaves from A to E) so there is an overlap in the note ranges of shifted octaves. The MIDI note ranges are as follows:

* Octave shift -2 maps MIDI notes 21 (A0) through 40 (E2)
* Octave shift -1 maps MIDI notes 33 (A1) through 52 (E3)
* Octave shift 0 maps MIDI notes 45 (A2) through 64 (E4)
* Octave shift +1 maps MIDI notes 57 (A3) through 76 (E5)
* Octave shift +2 maps MIDI notes 69 (A4) through 88 (E6)

Button Functions

The basic function of each of the four buttons on the back is as follows:

Special Button Combinations


There is method in the madness.. the wild flashing colours of the LED do actually indicate something sensible!

First off…

Other steady colours indicate the following:

The LED may also flash, alternating between one of the above colours (for octave shift) and one of the following

There are also flash patterns associated with tilt calibration as described in the previous section.