Convert SYX to AVR

Considering that .syx files actually contain instructions for a Yamaha synthesizer not actual audio data, it is unlikely that this file type can be converted to AVR format, which means direct syx to avr conversion is not doable. Unless you find a software that can reproduce the instructions to songs that could be exported to other audio files.

Simply put, it is impossible to convert SYX to AVR directly.
Thus, there is no so-called syx to avr converter or a free online .syx to .avr converter to be found.