Hey there, I actually do use default, although they are 0.8 and 1.0 for sounds respectively.
It's more of a general disclaimer just in case, and in future I plan to make some small tweaks as in Ep4 I introduced music and sound channels for much better transitions between songs/sounds and with tuned volumes for each, but I didnt have the time and it might have broken some saves if I introduced that for ep1-3 this time around. It will be fully fixed in next update though ^^