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"This Poly 800 has the reversed keys, plus the following modifications:
Potentiometer for filter cutoff frequency
Potentiometer for filter resonance amount
Filter slope switch (12 or 24 dB / octave)
Switch to toggle FM on/off
Potentiometer for FM amount
These additions extend the synth's range to far beyond a normal Poly 800 (although it can be used without the mods by turning cutoff to max, resonance to min, selecting 24 dB / octave and switching 'FM' to off). The FM can add harmonic overtones, or extreme distortion at higher amounts. Care should be taken with the resonance amount as, after about 75%, 'feedback' can occur quite suddenly (and loudly). Therefore, running the instrument through a compressor is recommended."
"For sale is a rare Roland TB303. It's in MINT shape and fully functional. Includes original box, manual, quick start card, warranty registration, carry case bag (also in excellent shape) and power supply (not pictured but one will be included). This unit looks like it was kept in storage for most of its life and hardly ever used, as there is minimal signs of use or wear. All the knobs turn smoothly, scratch free and buttons are all triggering properly. Super hard to find a 303 that performs are perfectly as this one. You won't have any issues with buttons double triggering or requiring firm presses, programming on this is a breeze. This one has been clearly babied over the years and it shows. No cracks, chips, dings or worn our corners like you find on most 303s. No wear around the knobs which shows it hasn't been used for intense filter or knob twisting action. No rust or grime or mildew funky smells either. Even the bottom looks perfect. I only found some very very minor signs of wear which was lightly from rubbing again the case while sitting in the box. Check out the detailed pictures below to make sure you like it. The battery compartment is clean, no battery leakage anywhere. One of the nicest 303 sets I've seen for sale in a while. The 303 is a must have for acid, techno, dance, electronic, hiphop and more. Especially awesome when paired up with a TR606, TR909 or TR808. Don't miss out on this classic synth!"
