http://www.bagse.com/technology/ROLAND_TB303_GUIDE_index.htm

1001 BINARY NOTE ON

1000 BINARY NOTE OFF

0000 BINARY CHANNEL 1

1111 BINARY CHANNEL 16

CV OUT ON 303 DOES NOT PASS ON ACCENT

MIDI PROTOCOL 3 STATUS BYTES TO MESSAGE 1 START BIT 8 DATA BITS 1 STOP BIT

CHANNEL A=CHANNEL B=KEYBOARD MIDI CHANNEL

WHA TCH OUT FOR CTR 01 = MOD AS THIS UPSETS OMNI OFF, POLY ON SYNTHS

SUCH AS JUNO 106 THE SYNTHESIZER BEING USED HAS TO BE INITIATED TO ITS OWN CHANNEL BY PRESSING THE MIDI BUTTON AND CHANNEL BUTTON FOR

SEVERAL SECONDS OR UNTIL IT WORKS JUST REPEAT, USUALLY THERE IS AN All NOTES OFF PROCEDURE THE ONE JUST EXPLAINED IS FOR JUNO 106/AlPHA2.

SWITCH THE FUNCTION SWITCH TO III FOR All DATA Rx AND USE A SYSX PATCH (FROM SEQUENCER) IF YOU GET STUCK.

FX EFFECTS

Fx improves all sounds. Same octave frequencies cause phasing so use effects as a phase reversal system.

Effects path should be as follows

Compression ---distortion---eq ---- chorus------ delay----- reverb

Within eq we have Q quality factor

Q= CENTRE FREQUENCY / BANDWIDTH

Where bandwidth is the useful frequency response between the -3dB points

e.g. if at -3dB the bandwidth is 500 Hz and these centre around the 1000 Hz mark then

Q= 1000/500 = 2

The 1 KHz mark is the most sensitive for hearing 800 Hz for voice so try to Q around this mark and sweep the eq on the mid range 350Hz to 4KHz this creates wah wah.

Reverb time is given as the time it takes for a sound to decay by 60 dB in level from the original, see delay timing charts.

Rt=0.161V/A

Sabine, for working out the reverb time of a room coefficient <0.2

Rt is reverb time in seconds

V is volume of room metres cubed

A is S * total room absorption

S is surface total in metres squared

@ is alpha is average absorption coefficient where

A=S*@