M800-R2– extended Virtual Analog [XVA] eurorack polyphonic synthesizer module. Multitimbral with 4 parts. A polyphony of 16 voices are shared by the 4 multi-timbral parts. All of these 4 parts have their own effect stack [Mod-Delay (flanger, chorus, vibrato), Reverb, Tube-AMP, EQ, LP-Filter, DYNAMIC (Limiter) , Stereo Delay ...].

The overall audio path is stereo. That means the oscillator, mixer filter, amps and effects are all in stereo.

Four independent Arpeggiator und Step Sequenzer may play one of the four Synth parts. The Trigger Sequenzer may trigger the built in transient sample player

(Drum Kit .wav) or send trigger to the MIDI-Out or the CV outputs. Overall the sequencers/arpeggiator & trigger sequencer may managed via the clip Launcher.

Whats the difference in the new version (Rev2)

The Hardware:

The hardware is completely new designed to mainly reduce the effort to build this wonderful device
Another reason was to expand the integration into the eurorack system (CV & GATE)
Hardware function keys for quicker navigation
Based on a powerfull Raspberry CM3+ (Quad-Core Cortex A53 1.2Ghz) industrial module
USB on the front panel
Reduced module depth (<30mm)
New encoder without rest (no LED ring)

The Software:

New XVA Synth engine

Has now a full stereo audio path starting from the OSCILLATORS through the stereo Filters (both A & B), through the stereo AMP (both A & B as well) and to the effect stack (every kind of effect is stereo). See Voice Structure

2 x Wavetable Oscillator with spectral morph capabilities or Algorithm Oscillator as alternated oscillator function. 4 Instances for each of them

Noise Sample based Oscillator

Enhanced Mixer for better audio signal path routing

Now 3 LFO's

The M800-R2 connects with 2x CV & 2x Gate to other eurorack modules. (This can be used as Midi to CV conversion or from the built in Arpeggiator/Sequencer)

USB Midi Device Manager with 4 internal Ports

Hardware:

Dimmension

Width: 32HP, Height: 3HU, Depth: ~30mm

Power Consumtion

+-/ 12V/18mA +5V/> 1.1A depends on the operating condition and connected USB devices

CV-Output

2x [1V/Oct] outputs 0-8V

Gate-Output

2 x Gate signals 0-5V

Audio In/Out

2x2 Channels maximal +-/8 V, audio rate 44100 smp/sec 24 bit

MIDI In/Out

1x Midi Input Output Port (16 Midi Channels)

USB 2.0

Hot connect for USB/Ethernet, USB-Midi

Connectors

Eurorack compatible 16 pin Header power connector, 6pin Header expansion bus connector (e.g M701)

Firmware OS:

The XVA-Sound Engine of the M800-R2 runs on top of a Linux OS with real time extensions. The overall boot time is < 30 sec.

All contents like wavetable-, sample-files, preset and sub-preset files are stored on the internal filesystem.

The filesystem is accessible over ethernet (USB-Lan Adapter).

Managing presets, samples, wavetables configurations & updates are possible and easy to handle.

Synthengine Structure

Spalte

VOICE Structure:

The heart of the voice are the two aliasing free oscillators (OSC1,OSC2).

This oscillators have two different modes

(Wavetable- or Algorithm-oscillator)

Each of them can run in 4 instances with detuning capabilities and spread in the

stereo channels in a different way.

The Noise is a sample based oscillator

which can be restarted with the Note-On, run free with fix pitch or follow the Note-On pitch. All oscillator outputs are stereo. These stereo outputs will feed in the mixer section. The output of the mixer has two paths which are the input for both stereo multimode filters (A/B). Both filter outputs feed the amps (A/B) and final these stereo outputs feed the effect stack.

Mixer:

The Mixer primary sum the OSC1,OSC2 Noise outputs. It can be decided which path (A/B) should be mixed to.

Cross fade between OSC1 & OSC2 are just on path A. The cross fade amount is a modulation target.

Multimode Filter:

Both MULTIMODE FILTER emulate some classical analog filter types such as filters with 12dB or 24dB filter depth (LP,BP,HP,NS).

Some filter types start self-oscillating on high

resonance values. The actual cutoff frequency will be displayed by the cursor in real time. The graphical view displays the filter curve in context with the selected filter type, filter mode and their individual parameters.

Modulation Matrix:

The modulation matrix has 24 slots.On each slot a modulation Source and modulation Destination can be defined. The amount
can be adjusted between 0-100% and the polarity can be reversed. 38 modulation destinations and 24 modulation sources are available.

Drum Instruments:

The Drum-Instruments are organized in 14 different instruments. On each of them the sample is selectable (stereo/mono sample .wav). The pitch, panorama, level, start/end points & fade out time is adjustable.

This collection of Instruments with their own settings are storable in a drum kit with a certain name. The dependent instrument is able to be triggered with midi over channel 10. The note number is selectable on each individual instrument. This is stored in the Kit File as well.

Another way is to trigger the instruments with the build in drum grid (drum machine).

Spalte

Wavetable Oscillator:

The wavetables are stored in the file system and can be updated. Should one or more wavetables have less than 256 waveforms, they will automatically expand to 256 waveform variants. The wavetable oscillator runs up to 4 instances. Detune gives a nice wide warm sounding spectrum, that spread into the stereo outputs. The spread is adjustable as well. Spectral morph capabilities with different algorithms push the sonic results to new dimensions.

Algorithm Oscillator:

This oscillator is used to generate classic waveforms but more in a variable form.

Variable form means that the waveform depends on the primary algorithm and
up to 3 parameters which generate the waveform. As an example: "VA-Sweep" algorithm changes the resulting waveform from a saw - tri (P1: 0-25%), tri - sin
(P1: 25-50%), sin - pulse (P1: 50-75%) and changing the pulse width (P1: 75-100%). Other algorithms are implemented as well (Dual PWM, HardSync-Saw, PWM, Formant Sin, Phase-Distortion-SIN, Fract PWM). This oscillator can be used to produce sounds which are typical in the analog synthesizer world. With the modulation capabilities you are able to do even much more. The oscillator is bandlimited and does not generate aliasing artifacts.

Noise Sample Oscillator:

This sample based oscillator (stereo samples .wav) allows to play ambient or noisy samples followed by using the Note-ON pitch or fix pitch. The sample can be played endless, looped (start/end points) or retriggered on Note-ON. The output of this oscillator can be continously mixed between Filter A/B to give this output an independent envelope.

Effect Section:

The Effect Section exists for ever part (A,B,C,D) independently. The Effect Section can be stacked and assigned in order.

(DELAY, CHORUS-FLANGER, EQ, COMPRESSOR, REVERB ...)

Arpeggiator & Step Sequencer:

The build in arpeggiator mode has a range up to 64 steps. The ASSIGN window includes K1-K5 which represents the played key at the selected step in the pitch order or the pressed order. The arpeggiators melody can be changed in real time by pressing other keys. The MODE window includes the settings: “off, on, legato” and specifies if the note should play or hold. In addition, the arpeggiator is able to act as a step sequencer. Within the sequencer mode each tone at each step can be shifted in semitones or octaves. If a key on the keyboard is pressed the sequence is shifted in relation to the fundamental tone.

Clip Launcher

The Clip Launcher enables you to create per Instrument (Parts A,B,C,D ,Drum CV1,CV2) alternate sequences (8) arpeggios or drum patterns. This give you a live control of the arrangement. You may build ,audition and experiment with those clips. It's also where you can perform, DJ-style with your clips. Clips launched on touch and/or a connected controller *APC-Mini (* is a trademark of AKAI Professional)

and more ...

Configuration example:

You may connect classic midi keyboards on the MIDI-IN port (3.5mm Jack) or midi based devices (Drum Computer, Synths ...) on the MIDI-OUT. Over USB you may connect midi controllers as well. In total 4 midi USB devices can be managed by the M800-R2.

With the build in midi device manager you are able to map those USB midi devices to a certain port (4 ports for MIDI Note & CC Events). In the midi settings you may choose that port for which Midi Note-Event or CC should be processed.

With the "midi learn" you may assign the most sound forming parameter to a certain midi device, channel and control.

The internal control bus allows the expansion for additional control modules.

M800-R2 extended Virtual Analog Synthesizer