ESP-StepperMotor-Server VS ESP32-A2DP

Whole thing is programmed using Arduino library in platformio and for a2dp sink im using pschatzmann library https://github.com/pschatzmann/ESP32-A2DP

The ESP8266 won’t work, since it doesn’t support Bluetooth. You’ll need an ESP32 and an I2S DAC. I built something similar based on this library: https://github.com/pschatzmann/ESP32-A2DP

I want to turn a USB computer keyboard into a musical instrument where i can press a key and a sound is played on my bluetooth speaker. I have played around with https://github.com/pschatzmann/ESP32-A2DP and managed to hardcode a little tune and play it on the speaker. Unfortunately that alone already uses 80% of the esp32 flash memory and I need some more space to read the keyboard input and do a little bit of sound design on top of that. I’m looking for suggestions on a controller (combination of controllers) would be best suited for the job, with the constraint that it should have low power consumption.

Check out arduino-audio-tools and other libraries it can make use of, such as ESP32-A2DP. It's tailored towards ESP32 devices, but also supports the RP2040 and others.

For all other i2s pinouts, I'm leaning on this GitHub-project: https://github.com/pschatzmann/ESP32-A2DP

You can use Bluetooth A2DP. This is the same standard used in Bluetooth headphones. Several implementations are available https://github.com/pschatzmann/ESP32-A2DP

A2DP library: https://github.com/pschatzmann/ESP32-A2DP

I recently discovered that the ESP32 could be used to receive audio via Bluetooth and since I'm using one as part of my build anyway (for controlling peripherals and LED outputs) I was thinking to just use the ESP32's onboard Bluetooth rather than a dedicated chip/module. After looking through some example code and the ESP32-A2DP library, I feel confident that this would work but is anyone able to see any caveats in doing this other than not being able to support aptx?