Yes, you have to set Renoise output’s samplerate to match the supported rate of your bluetooth headphones. This can be 44,1kHz or 48kHz. There is no way to samplerate convert here. Renoise currently lacks of a detection whether a bluetooth output actually supports the selected sample rate, that’s all. It should work fine, once you selected the proper sample rate. Note that you can’t switch the sample rate as long as you selected the bluetooth output, so first switch to a normal output, change the sample rate, and then switch back to the bluetooth device.