# Transposer

Note transposition via increment/decrement buttons.

> Original: `Transposer.ino`

```cpp pico
#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
#include <cs_midi.h>

using namespace cs;

BluetoothMIDI_Interface midi;

Transposer<-12, +12> transposer;

NoteButton button {5, {MIDI_Notes::C[4], Channel_1}};

IncrementDecrementSelector<25> selector {
    transposer,
    {2, 3},
    Wrap::Clamp,
};

int main() {
    stdio_init_all();
    if (cyw43_arch_init()) return 1;
    Control_Surface.begin();
    while (true) {
        Control_Surface.loop();
        sleep_ms(1);
    }
}
```