7.1 Description

The MOTOR Synth features a powerful FILTER section with two identical analog multimode filters for each MOTOR VOICE and a digital filter for the DCO. In total three fully featured multimode filters. All three filters share one set of knobs and can be controlled either individually or all together.

The digital filter is an emulation of the analog filter and so shares the same functionality and parameters. The filter modes are 24 dB Low Pass, 12 dB Band Pass, 12 dB High Pass and 24dB All Pass. There is a DRIVE circuit before each filter as well as independent FILTER ENVELOPE with variable ENVELOPE AMOUNT. The RESONANCE control can push each filter into self-oscillation and as each filter is calibrated to precisely track pitch, self-resonating filters can be used as oscillators.

❕ Note: The MOTOR Synth signal path before the FILTER is polyphonic where each motor and digital oscillator has a dedicated amplifier controlled by a individual envelope. The FILTER section is paraphonic, where all 4 motors of each MOTOR VOICE and all 4 oscillators of the DIGITAL VOICE are mixed together and passed through one FILTER.

7.2 List of parameter

All three FILTERS share one set of controls that can either control one of the FILTERS at a time or all FILTERS at the same time. Additional parameters in the FILTER SCREEN are controlled with the ▶ LEFT & ◀ RIGHT SCREEN ENCODERS. Push the V1 FILTER, V2, FILTER or DCO FILTER buttons to access the FILTER SCREEN of the given voice.

This list contains an overview of all parameters in this section. For further information refer to the Instructions sub-section.  This list does not include FILTER ENVELOPE parameters, because the FILTER ENVELOPES function and have the same parameters as AMP ENVELOPES.

7.2.1 Entering and navigating the FILTER SCREEN

Push V1 FILTER, V2 FILTER or DCO FILTER buttons to enter the FILTER SCREEN of the corresponding voice.

SCREENSHOT AR V1 FILTER SCREEN

Once the FILTER SCREEN is active it is possible to toggle between the voices by using  the < / CLEAR and > / RESET buttons in the bottom left corner of the MOTOR Synth. This navigation option is suggested by the small arrow symbols [< >] at the top of the FILTER SCREEN.

7.2.2 Setting the basic FILTER parameters [TYPE], [CUTOFF], Resonance [RES] and [DRIVE].

Turn the TYPE rotary switch to choose the Filter Type [TYPE]. All four filter types are resonant and can self-oscillate including the 24dB All Pass filter “AP24”.

Turn the CUTOFF FREQ knob and set the Filter Cutoff Frequency [CUTOFF]. This knob functions as coarse tune control and is fully sufficient in most cases. If a fine tune control is required to set a very precise cutoff frequency turn the ▶ LEFT SCREEN ENCODER.

❕ Note: The FILTER Cutoff Frequency [CUTOFF] ranges from 20 to 21096 Hz. However, the default [CUTOFF] measurement unit is cents where 0 cents correspond to a frequency of 20 Hz or roughly E0 note. The preferred measurement unit (hertz or cents) can be changed in the SYSTEM MENU. Using cents as a measurement unit is useful when utilizing the Keytrackng [KYTR]. The measurement in cents will indicate the [CUTOFF] offset from the note pitch. For example, if Keytrack Amount [AMNT] is set to 100 then [CUTOFF] set to 1200c corresponds to [CUTOFF] one octave above note pitch.

Turn the RESONANCE knob to set the Filter Resonance [RES]. Self-oscillation starts around value 87, but the effect depends on other parameters.

7.2.3 Setting the FILTER ENVELOPE and Envelope Amount [ENV AMN]

7.2.4 Using Keytracking [KYTR]

FILTER CONTROLS

To start – let’s adjust the Filter controls for MOTOR Voice 1 by pressing the V1 FILTER button.

The V1 button will light up and you will see the V1 Filter controls displayed on the SCREEN.

The FILTER features dedicated control knobs for:

• FILTER MODE
• CUTOFF FREQUENCY
• DRIVE
• RESONANCE
• FILTER ENVELOPE
• FILTER ENVELOPE AMOUNT
• KEYTRACK (with AMOUNT and GLIDE)

Use the RIGHT SCREEN ENCODER to switch Filter KEYTRACKING ON and OFF and adjust its AMOUNT (depth) and GLIDE (slew) parameters.

Pressing the FILTER ENV ENCODER will open the FILTER ENVELOPE SCREEN:

Here you can set up all of the FILTER ENVELOPE Parameters depending on Various Envelope Types (See AMP ENVELOPE section).

To adjust the FILTER SECTION for MOTOR Voice 2 or for the DCO, press the according FILTER Button – V2 FILTER or DCO FILTER.

You can also use the < & > ARROW Buttons to navigate between the Three voices when the FILTER SETTINGS SCREEN or the FILTEr ENVELOPE SCREEN is activated.

As you Navigate between voices – you will see the respective FILTER Buttons light up.