Roland EF-303
Groove Effects (1999)
Groove Effects (1999)
Company: Roland
Model: EF-303
Class: effect module
Dates: 1999
Technology: digital effect
Synthesis: Virtual Analog
Resolution: 20 bits
Sampling rate: 44 kHz
Algorithms: 16 models
Sequencer: 16 steps
Tempo: 40 to 240 BPM
Sync: Midi clock
Memory: 16 slots
Tuning scale: 21 models
Midi: IN / OUTs
PSU: 9VDC
Price: 250€
EFFECT MODULE Main panel features a segments display, 16 sliders, 7 knobs and 30 buttons.
Rear panel terminal connectors:
- Midi interface
- RCA stereo outputs
- headphones
- microphone input
- line RCA input switch between line / phono with ground terminal for turntables.
- ac Power supply is a 9V external DC PSU negative polarity -)+
none
- No official VST plugin
- no known samples library
Have some EF-303 sample set you want to share? CONTRIBUTE :)
owner's manual download
service manual download NOT AVAILABLE
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VOICE Internal DSP resolution works at 20 bits / 44 kHz sampling rate.
The EF-303 groovebox is a fully digital unit which manages 3 main sound sections: described in details below:
The 16-steps fx modulator is especially designed for real-time visual performance. The principle is quite simple: the step modulator cyclically changes the effect settings to a specified values and creates moving textures or rich rhythmic patterns (It is also possible to set the number of steps for a sequence, up to 16 at 480 ticks per note resolution). Modulator motion can be played in 5 modes:forward, backward, pendulm, random and forwardbackward.
The virtual Drum on modelling virtual analog.
Drum Patterns are recorded using the step modulator. Each step slider is split into 5 equal zones and each of them corresponds to a specific percussion between 5 percussions:
- muted (no sound)
- open hihat
- closed hihat
- snare drum
- bass drum.
Alsoa virtual analog and emulates the iconic TB-303 bassliner: notes are entered using the step modulator sliders from bottom position for lower octave to higher, in addtion the bassliner has some sonic controls including filter cutoff, resonance and slide emulation (but no accent "twang").
| Algorithm | Name | Description |
|---|---|---|
| 1 | filter | classic cutoff filter with resonance and a digital LFO |
| 2 | isolator | boosts or cuts specific frequency ranges on 3 bands low / med / high |
| 3 | flanger | classic short delay metallic effect with LFO modulation |
| 4 | pan delay | echo with panning ping-pong effect |
| 5 | reverb | adds classic reverberation |
| 6 | pitch/delay | shifts the pitch and adds a time delay |
| 7 | slicer/pan | tremolo effects with stereo panning variation |
| 8 | comp | adds dynamic compression |
| 9 | LO-FI | reduces sound quality lowering the sampled BIT depth (bit crusher) |
| 10 | ring mod | is a digital ring modulator |
| 11 | phaser | phase shifting effect with own LFO |
| 12 | voice | formant pitch shifter as voice changer, ROBOT for synthetic voice |
| 13 | Vo Mod | use input to modify the internal synth generator |
| 14 | Syn+DLY | plays a lead sound + delay effect |
| 15 | Syn Bass | plays a bass sound |
| 16 | Syn Rhythm | plays the rythm sounds |
SYNC internal frequency range is from 40 to 240 BPM or defined by TAP button. The sync function provides 12 tempo dividers: 16th, 16th dotted, 8th, 8th dotted, quarter, half note, whole, 2 whole notes, four whole notes, 16th triplet, 8th triplet and quarter note triplet.
MIDI synth and drum can be triggered by Midi and EF-303 knobs do transmit Midi CC#.
MEMORY features :
- 16 setups that can be data dumped to Midi sysex.
- 21 tuning scales : chromatic, diatonic, minor, dominant, whole, pentatonic and more.
- drums and tb are average
- no CV sequencer options
- idea
- real time edit
Roland EF303
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