8bit 4bit 1bit music is much fun. Reminds me of my Sinclair ZX81 and Z80 assembly code... squarish sounds
For people that care about aliasing, oversampling is an option.
Here is a thread that describes some recipe:
http://forum.cockos.com/showthread.php?t=178543
The other option is to use a higher sampling rate for the project if your soundcard and CPU can support it.