I hear a warbling sound when I stream. Is it your fault?

Other than encoding your audio into the various streaming and download formats we offer, we don’t do anything to your upload -- no EQ, boosting or multi-band companding, and definitely no two-pole Butterworth band-pass/band-reject filtering (so tempting). In quiet passages, some MP3-128s can indeed exhibit a warbly sound (occasionally described as “muddiness,” “low fluttering wavy stuff,” “distortion in the bottom end,” or just “compression artifacts”). Using a compression filter on your source audio can exaggerate this effect, so… don’t do that. We chose MP3-128 for streaming as a compromise. It enables your music to start up quickly over the slowest of networks, yet still sounds great for most tracks. Our various download formats offer fans an even higher quality experience, and the lossless formats are exactly as you uploaded them.