MATRIXSYNTH

Rebel Technology Witch: Compact Versatile Polyphonic Synthesizer

videos uploaded by Rebel Technology

Playlist:

1. Rebel Technology Witch: SubTract Patch

First demo of our upcoming Witch, a patchable synthesizer in a compact format.

SubTract is one of the factory patches: a polyphonic Virtual Analogue synthesizer with 48dB resonant low pass filter, two assignable tap tempo LFOs, envelopes, FM, and overdrive effect.

2. Rebel Technology Witch: VoSim Patch

Rebel Technology Witch is a patchable synthesizer in a compact format.

Demo of the VoSim polyphonic synthesizer patch, which has high and low formants, two tap tempo LFOs and adjustable envelopes. The audio inputs are used for FM.

The first part demonstrates Performance mode, which allows for chords to be easily triggered and sustained.

In the second part an AKAI LPK-25 MIDI keyboard is used to play and sequence the patch in Expression mode, which gives continuous pitch control.

3. Rebel Technology Witch: WaveBank vs Ensoniq SD-1

Witch WaveBank meets the Ensoniq SD-1 classic synthesizer, thanks to a cheap MIDI to USB converter.

The Witch plays the lead synth track, at first receiving MIDI directly from the keyboard, then sequenced from the SD-1 which also plays the other parts: bass, pads and percussion. The Witch and SD-1 are passively mixed and direct recorded into a Zoom Q2N camera.

There are no effects on the Witch output apart from the built in delay, which is tap tempo synchronised to the sequencer track.

WaveBank Performance is a stereo morphing wavetable synth that you can load your own wavetables into. It is one of eight synth patches that comes with the Rebel Technology Witch, a patchable synthesizer in a compact format.

via Rebel Technology

"The Witch is a compact and versatile polyphonic synthesizer.

The Witch can be used Standalone, with a MIDI Controller, Analog Sequencer, or MIDI Polyphonic Expression / MPE Controller. It comes with four different synth engines:

SubTract Virtual Analogue synthesizer with 48dB resonant filter
VoSim Voice Simulator formant synthesizer
WaveBank Morphing wavetable synthesizer
QuadSampler Sampler with peak filter
Each synthesizer engine is provided in two variants:

Expression Mode Continuous pitch control and MPE support
Performance Mode Discrete pitch control, standalone chords and classic MIDI support
Other features include two assignable tap tempo LFOs with continuously variable shapes and a powerful effects section.

As well as eight factory patches, the Witch is fully compatible with the OWL Library of more than 300 patches. What’s more, users can create their own patches using any of the supported DSP languages: Pure data, Max gen~, SOUL, Faust, Maximilian and C++.

The Witch has its own Synth Editor web application: witch.rebeltech.org

The release date for the Witch is July 29. Kits will be available from Befaco."

Patch Tuesday: Audio-Frequency Hold Modulation with Filter 8

video upload by Joranalogue Audio Design

"Among the many features unique to Filter 8 is its hold input, which can be used to 'freeze' the filter core. It'll respond not just to gate signals, but to audio sources as well. In this #PATCHTUESDAY video, we're using this to good effect! #eurorack"

via Joranalogue

Representing the cutting edge in modular analogue voltage controlled filter (VCF) design, Filter 8 offers more possibilities and higher fidelity in 12 HP than ever before.

Starting from the classic OTA-style 4-pole cascaded lowpass (LP) topology, Filter 8 features separate LP outputs, each with their own character. Additional filter responses are achieved by pole mixing: 1-pole highpass, a special band boost and notch response, phase shifter and 4-pole bandpass. All outputs are available simultaneously.

Key to Filter 8's performance is the innovative resonant feedback circuit. By increasing the resonance, all outputs will resonate at the filter frequency, without any low frequency response loss. At higher resonance levels, self-oscillation is achieved, turning the module into an excellent 8-phase sine wave voltage controlled oscillator (VCO) with temperature and switchable gain compensation, low distortion, constant amplitude and accurate frequency tracking over at least 5 octaves. At sub-audio frequencies, Filter 8 can function as an 8-output voltage controlled slew modifier or 8-phase low frequency oscillator (LFO).

Simultaneous exponential and linear frequency modulation is possible, for classic FM tones or chaotic modulation. A hold feature is also provided, 'freezing' the output voltages manually or under gate control. This is useful for halting modulations, or as a sync-like effect at audio frequencies. The dedicated ‘ping’ input allows you to easily create crisp percussive sounds with different timbres.

While rooted in the legacy of classic synthesisers, Filter 8 provides a new approach to musical signal generators and modifiers: instead of simply a VCF, VCO, slew modifier or VCLFO, a single analogue module can now be any of those, and anything in between.

Analogue 'OTA style' cascaded 4-pole lowpass VCF with self-oscillation capability.
Filter outputs: 1-through-4 pole lowpass, 1-pole highpass, band boost+notch, phase shifter, 4-pole bandpass.
Self oscillation: 8-phase sine waves, separated by 45°.
Accurate temperature-stable sine wave VC(LF)O with fine and coarse tuning.
Simultaneous exponential and linear FM, including depth polarisers, dedicated 1 volt/octave input and LFM AC-coupling switch.
Unique voltage controlled resonance topology: all outputs resonate with absolutely no loss of low frequency response, unlike common 'bass compensation' methods.
Resonance compensation gain switch: adjusts output gains for equal amplitude self-oscillation (10 Vpp).
LF mode for slew modifier or LFO use. Ultra-wide total frequency range: 2.8 mHz (6 minutes) to 27 kHz, a range of nearly 10,000,000:1!
Dual signal inputs increase patching flexibility.
Impedance-compensated outputs with dual-colour LEDs.
Voltage hold feature 'freezes' the filter core. Pause LFO modulations, or create pulse-width-sensitive sync sounds at audio rates. Also useful as clickless output mute. Manual or gate control.
Dedicated ping trigger input: 'strike' the filter core using any trigger or gate signal and easily create percussive sounds with 8 different timbres.
Trim potentiometers accessible from the front panel.
Precision-milled 2 mm anodised aluminium front panel with high-resolution, non-erasable graphics.
Bullet-proof design: polarised power header and MOSFET protection circuit.
Includes 16-to-10-pin Eurorack power ribbon cable.
Premium mounting hardware: black screws, black nylon washers and matching hex key.
High-quality components and assembly; designed and made in Belgium.

1985 Roland TR-727 "The Rhythm Composer that keeps you in the groove..." Brochure

via Retro Synth Ads where you'll find the rest of the scans and the write-up.

"Roland TR-727 drum machine "The Rhythm Composer that keeps you in the groove..." four page colour brochure from October 1985."