Some features are disabled in mute-mode to make sure you will not accidently save, download or comment on a different jamtrack from the one you are currently hearing. You may either lift the mute-mode to download or interact with the currently displayed remix, or move to the currently playing track with the green GOTO button.
Doc's singing is awesome. A combination of two bass tracks is a great idea. A sax solo is a wounderful finishing touch. Soft and calm drumming matches the whole track perfectly. At first I just wanted to mix the parts to give them more air and clarity, but in the end I added a tiny bit of synth pad - just to glue everything together. Enjoy :)