sixteenth note. Other time signatures can be programmed by changing the Last Step (length of patterns) and the scale, allowing for shuffle and swing rhythms. Two or more Patterns can be combined, using Pattern Chaining, to play as a single pattern. Each pattern in the chain occupies a pad, but it will only trigger the chain as a whole, not the individual pattern. Up to six tracks (songs) can be programmed using combinations of patterns. Each song can consist of up to 423 bars (patterns). Keyboard and external control The TR-505 consists of 16 individual instrument/ pattern pads. The pads are not velocity sensitive, but can be modified by the Accent parameter. The TR-505 can transmit and receive on MIDI channels 1 through 16 and Notes numbers 25 to 99. It also contains a MIDI Omni mode allowing it to receive all MIDI data. The TR-505 responds to the following MIDI messages: Key message - trigger signal for the individual voice. Velocity message - Note-on velocity is both transmitted and received allowing more expressive. Track Number message - track/song select Bar Number message - Song position Clock message - tempo synchronization, start, stop, etc.. Storage The TR-505 can store 48 ROM patterns, 48 RAM patterns, 6 tracks, and a maximum of 423 measures. The Tape interface (in/out) allow the Tracks and Patterns in internal memory to be stored on external tape. Data can be Saved, Verified, and Loaded from the tape. Modifications There are companies, websites, and magazine articles documenting a DIY process for circuit bending and modifying the factory setting of the Roland TR-505. An example of a few modifications include changing audio samples, voice circuit bending, adding individual audio outputs, adding CV outputs, adding pitch change to each voice, and adding circuits to randomize sequences. Notable users Vince Clarke Nick Rattigan Eyedress References Gilby, Ian. Gilchrist, Trevor. "Drumatix Goes Digital". Electronics & Music Maker. May 1986. p. 38-39. Reed, Tony. "Roland TR 505 Rhythm Composer". International Musician. May 1986. p. 102-103 "Roland TR505". Making Music. April 1986. p. 27-28 Further reading Roland TR-505 Owners Manual, Osaka, Japan: Roland Corporation Roland TR-505 Service Manual, Osaka, Japan: Roland Corporation Alex Grahm. Rhythm Machines 2. self-published. 2018. . External links Roland TR-505 Rhythm Composer | Encyclotronic - Review, Tech Specs, Images, Media, and Purchase Links Roland TR-505 ROM Expansion | HKA Design - Sample modification kit for TR-505 Roland TR-505 |