x0xb0x // xoxbox // Roland TB-303 clone // 100% analogue acid bassline synthesizer

The ultimate Roland TB303 clone - 100% analogue reproduction

A mint condition x0xb0x, hand-built by myself. I am a professional electrical engineer with thousands of hours of soldering and electronic assembly experience - you can trust that this unit has been thoroughly tested and also calibrated exactly to specification, unlike many others on the used market!

This is the rare "Willzyx" model of the open-source x0xb0x. It features a brushed black metal faceplate and red LEDs.

The power supply is also included in the sale - but please note that it is suitable for UK/ EU 230-240v mains usage only! If you are an overseas buyer please contact me and I will help you find a compatible alternative.

Description from the x0xb0x project:

"The x0xb0x is not just another MIDI-controlled TB-303 clone. x0xb0x is a full reproduction of the original Roland synthesizer, with fully functional sequencer. The sequencer can be programmed just like the original 303 (ok its actually a little easier, we think) and can be used to control other synthesizers via any of its various output formats. 128 banks of track memory and 64 banks of pattern memory are stored in onboard EEPROM, no battery-backup is needed!
p.s. x0xb0x is pronounced "zocks box"

An original TB-303 was disassembled and reverse-engineered to verify the schematic. The original transistors were analysed using big expensive curve-tracers to determine their characteristics. We measured every waveform and counted every cycle to give you the best sound...its just like the original because it IS the original."


Input/Output

x0xb0x has all the I/O you could ever need:

• MIDI in, out, and thru
• DIN Sync (in or out, selectable)
• CV and Gate (1/8" jacks)
• Audio: headphone, mix-in and line-level out (1/4" jacks)
• USB for computer interface & control

Extras

We added a couple extra modes to make the x0xb0x more fun than the rest

• Random mode: fill a pattern bank with random notes, or have it just play random notes
• Keyboard mode: just like those casios you had as a kid. Press the keys and sound comes out!
• Rotary encoder tempo knob: for finer control over the tempo, or you can set the tempo via computer control mode
• Firmware upgradable: the C code is written for AVR-gcc, any Mac/Linux/Windows computer can be used to recompile new code for the x0xb0x. Reprogram using the x0xb0x software with USB. Mess something up? You can always revert back to the original firmware.