So I got a reply, and basically they haven't thought of sound quality first. here's what I got back.
Thanks for writing in about this. Sometimes our transcoding system can create audio artifacts, as we transcode all tracks to 128 kbps mp3 for streaming playback. Uploading a lossless or high-quality lossy file will usually reduce these to a minimum, but unfortunately there's not much we can do for the handful of individual tracks that are still affected.
Basically we're fighting on two fronts here. We want uploading to be easy and accessible to everybody and to keep lots of content on site from a wide range of people. This is why infrastructure is paramount to our scaling plans and is why audio quality hasn't been the number one priority up to this point. With this said, we acknowledge that sound quality is very important and hopefully we can address this in the future.
Please note that if you choose to make your track downloadable, the version users can download will be an exact copy of the version you uploaded, without any transcoding.
I love the downscaling of the problem in their eyes, "the hand full of tracks that are effected" what the fuck!?, do they not get it at all, everything is affected and downgraded, and look how much they charge you to have a pro plan, so we can listen to each other in shit quality.
So this could answer why some of the Lo-Fi beat makers can sound weird, and sampler made (I'm talking hardware not samples) tunes lose quality, Distorted sounds getting replaced with shit distortion and transcoding. Add people limiting there shit through the roof and BOOM!! broken speaker cones will flap like like broken pigeon.