I'm REALLY HAPPY I found this thread.
Well here is my two cents. Colour ME impressed!!!
The Sansa Fuze love affair started with a tryst with a v.01 model, Rockboxable at the time, unlike the v.02's which were SansaAMS and still waiting for that coding love by the Rockbox team to come to fruition.
It's now a big release or two forward for Rockbox' Firmware, 3.7 to be exact and the Fuze v.02 is a first class citizen to install the Alternative Firmware to...
Good stuff ppl, good stuff!
I loved that v.01 unit to pieces, literally. I think I rolled over it with my desk chair and mashed the polycarbonate shield and LCD beneath it as well. Oh well, we had FUN TIMES!
IT SOUNDED GLORIOUS. Stood toe to toe with the best players I had: Rockboxed iRiver H140 feeding a D10 optically (not as beefy, but in the same league), my Gorgeous sounding WM8987 Wolfson DAC equipped Lisse Q10, and my s:flo2, sporting Wolfson WM8740's in dual mono configuration. Yeah the Rockboxed and EQ leveled fuze stood its ground with these much pricier and heartier equipped giants.\
So all in all I gave the Fuze v.02, newly acquired, a workup of Rockbox settings to match the iRiver H140, including the "BioEQ" with some tweaking of the Low Shelf filter for bass beefiness by Yours Truly, but I owe the gifting of the BioEQ Filter to HiFlight for passing it along to me. It's a special setup designed around the premise of the Fletcher-Munson Curve and handles inner ear curvatures and reflections quite nicely.
You don't have to take my word for it, I'll post the entire setup as a gift to the Head-Fi.org Community to play with at their leisure. It does NOT need tweaking for different phones. The only thing is you may want to adjust the gain in the low shelf (LS) filter of the Graphic Equaliser to tailor the bass to your needs.