I suggest you don't spend effort on designing any settings pages before you actually need them. As mentioned before, most of the audio related settings don't make any sense in a modern audio player. You can expect to be able to output floating-point audio pretty much anywhere, and you certainly don't need to specify a number of buffers to keep with any modern cross-platform audio library. The only settings that really make sense are the device itself, sampling rate (which should default to 48 kHz because that's what every audio hardware is running at these days), buffer length and maybe number of channels (stereo/quad, if someone wants mono they can use the stereo separation slider).
Personal opinion: I wouldn't use a pure module-only player in 2020. In fact, I switched away from ModPlug Player to Winamp in 2005 or 2006 and eventually to XMPlay in 2007, I think. Being able to play both modules and streamed formats without having to switch software is just extremely convenient. If I were you, I'd try to at least support all common streamed music formats (MP3, Vorbis, Opus, FLAC) as well.