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(see example patch). It's also useful for patching the SMR to itself (Env Out → Rotate Trigger jacks and Lock jacks)

Pre | Post

The Pre | Post switch selects whether the signal to be analyzed is taken from the raw audio input, or if it's attenuated by the 
channel's slider.
When the switch is set to Pre, the Env Out jacks will respond to the frequency content of the input signal and not be effected 
by the sliders or Level CV jacks. This is useful in cases where you want to use the Env Out jacks to control or modulate other 
things in your patch, while also using the sliders to control the mix on the SMR's audio outputs. 
When the switch is set to Post, the Env Out jacks will act as if the frequency content of the channel was attenuated by the 
slider and Level CV jack. Therefore in Post mode, the Env Out jack will output zero when the slider is all the way down (and 
no Level CV is applied). With Fast | Slow set to Trigger (center position), the slider effectively sets the threshold level for 
which is a trigger is fired. This is crucial for advanced beat-syncing (see example patch).

CV Slew

CV Slew is a switch that smooths out rapid changes on the Level CV jacks, allowing you to use gates and clocks into the 
Level CV jacks without hearing pops and clicks. This is useful for patching a QCD, RCD, or SCM directly into the SMR. 
To use CV Slew, flip it to the left. Any sharp transition on the Level CV jacks will be smoothed out.
The amount of smoothing is controlled by the position of the Morph knob 

at the moment that CV Slew switch is flipped on

. So 

if Morph is all the way up when the CV Slew switch is thrown, more smoothing will be applied than if the Morph knob was all 
the way down when the switch is thrown.

Advanced Features

Updating firmware with the Audio Bootloader

The SMR contains a bootloader that is used to update the firmware by playing an audio file into odds IN jack.
Firmware audio files can be downloaded at http://4mscompany.com

  

/  smr.php

1.

To enter bootloader mode, power off the SMR and connect a computer or smart phone audio output to the odds IN 
jack. Either a stereo or mono cable is fine. Plug the evens OUT jack to an amp/speakers so you can listen.

Remove your phone case, it may be preventing the cable from fully plugging in.

2. Set the computer/phone's volume is at 100% 

and the audio player software is also at 100% volume. Turn off all 

audio and vibrate notifications (use Airplane mode).

3.

Hold the ROTATE button down while powering the SMR on. Keep holding it down, and release the button when you 
see just a single light on, slowly changing color. The SMR is ready to receive firmware.

4.

Begin playing the file. Immediately you should see the slider LEDs do a sequential animation, and the light ring slowly 
filling up with lights, and then clearing, then filling up again. Do not interrupt the process! You can monitor the audio by 
listening to the evens Lock jack or the audio OUT jacks.

5.

If at any time two of the Lock lights turn on (channels 2 and 3, or channels 2 and 4) and the other lights stop 
animating, then an error has occurred. Verify the cable is not loose, all sounds/vibrate/notifications are off, and that 
you have downloaded the audio file completely (avoid streaming or playing from the browser). Check the volume is at 
100%. Remove the protection case from your smart phone. Stop the audio file, reset it back to the start, and tap the 
ROTATE button to reset. The single flashing light should come on and the Lock lights should turn off. Play the file from 
the beginning again.

The open-source licensed files for the firmware can be found at https://www.github.com/4ms/SMR

Firmware Version

To view the firmware version, tap the ROTATE button 10 times rapidly to enter “Custom Scales” mode. Starting with Firmware 
version 2, the Blue/Green/Red elements of the Env. Outs LEDs read as a binary code of the firmware version number, with 
Channel 1 Red being the least significant bit, and Channel 6 Blue being the most significant bit.

Firmware version 1: All Env Out LEDs normal colors (no binary code)

Firmware version 2: Channel 1 Green 

(000 000 000 000 000 010)
(Ch6 Ch5 Ch4 Ch3 Ch2 Ch1)
(BGR BGR BGR BGR BGR BGR)

Future firmware versions will follow the same format:

Firmware version 3: Channel 1 Yellow 

(000 000 000 000 000 011)

Firmware version 4: Channel 1 Blue 

(000 000 000 000 000 100) etc...

Custom Scales

Tap the ROTATE button 10 times rapidly. All the Lock lights will illuminate, and only one light in the light ring will turn on. This 
is Custom Scale Edit mode. There is one Custom Bank, containing 11 Custom Scales. You can choose which Custom Scale 
in the bank you are editing by tapping the Rotate button to select the scale, just like you do in normal operation. Tap it again to 
return to selecting the note. Each note in the scale can be assigned a frequency. To choose the note for which you want to 
change the pitch, turn the ROTATE knob and the light will move around the light ring, indicating which of the 20 notes you are 
currently editing.
To edit the pitch of a note you just selected, press any Lock button. This will unlock the note, and allow the pitch to be 
changed. You may want to turn up Res (Q) so you can hear the pitch, or you can keep Res (Q) turned down and run audio 
into the SMR to select a frequency based on what it filters out. 

Slide the sliders to edit the pitch:

Slider 1: Octave select (10 octaves)

Slider 2: Semi-tone select (12 notes within the octave)

Slider 3: Micro-tone select (52 micro-tones within the semi-tone)

Slider 4: Nano-tone select (Fine tuning micro-tone control)

Sliders 5 and 6: not active

14

Summary of Contents for Spectral Multiband Resonator

Page 1: ...ts outputs and a host of unique features allows for many uses Create beautiful moving chord structures quantized to selectable scales Process audio like a classic filter bank EQ Pluck ping strike to ring like a marimba gong or membrane Beat sync to an audio track triggering modular sounds in sync with original audio Vocode outputting spectral data to a second SMR Re mix tracks Harmonize to audio Q...

Page 2: ...v Out LEDs Brightness of each light shows level of each filter Resonance Q Res Q CV jack 0 to 5V Knob offsets CV jack Stereo input and output divided into even odd bands Odd input jack and Even output jack serve as Mono in out Clipping LED between IN jacks flickers when input is clipping about 20Vpp or 10V Rotation shifts frequency pattern up or down Rotate Clockwise trigger input 2V threshold Rot...

Page 3: ...xponential decay and different timbral qualities when plucked Freq jacks no longer track 1V oct in this mode Slider LEDs can be selected to display clipping and level or just level Firmware can be updated by playing encoded audio files from a computer into the SMR Specifications 26 HP Eurorack format module 16 to 16pin eurorack power cable included 0 95 24mm maximum depth Power consumption 12V rai...

Page 4: ...tating and pushing different sliders up and down you can make different chords Play with Morph as you continue to turn the ROTATE knob Morph sets the speed at which rotation happens With Morph at 100 when you turn the ROTATE knob the SMR will slowly fade from one position to the next With Morph at 0 the SMR will instantly jump from one position to the next Play with Spread which controls the numbe...

Page 5: ...the sliders to adjust the level of each note Input another trigger source into Rotate Trig or Rotate Trig If you don t have another trigger source you could input an LFO or envelope 0 to 5V into Rotate CV In and the rotation will track the waveshape of the incoming CV Play with slowing down the rotation from the external triggers by turning up Morph Try setting the rotation trigger source super fa...

Page 6: ...hile holding down the Lock button The Lock button will be lit if the channel is locked and also flicker if it s Q locked If you don t lock the Q then the channel s resonance will be controlled by the RES Q knob and jack along with all the other channels with unlocked Q Repeat this process steps 5 7 for channels 2 6 Note that for channels 2 4 and 6 the Freq Nudge knob on the right is used while for...

Page 7: ...e it depends on the pitch of the kick you re trying to tune into Set Freq nudge to dial in a frequency in between two rotation spots Turn Q up to narrow the band Around 50 is a good place to start for syncing to drum sounds Set the Level slider to set the threshold at which the trigger fires If you set it too high the Env Out light will stay on and it it s too low it ll stay off If the slider seem...

Page 8: ...hnique outlined in the Re mix patches setting the note scale bank and resonance of each channel on both SMRs Usage Channels Six resonant filters The core of the SMR is six resonant band pass filters The six channels take their inputs from the audio IN jacks and their outputs are mixed together using the sliders and Level CV jacks The mix is then fed to the audio OUT jacks The audio IN jacks are no...

Page 9: ...ency for instance with a stereo input where you want the same filtering to happen to both left and right you can rotate them to adjacent spots on the light ring and turn Freq Nudge all the way up for the lower channel Alternatively you can program a custom scale with duplicate frequencies Freq Nudge knobs There are two Freq Nudge knobs one for the odd channels and one for the even channels A switc...

Page 10: ...uency of any of the channels that channel will ring and continue ring for a bit after the VCO has left that frequency When the resonance is low the six channels act more like band pass filters Each slider controls the volume of that band If the bands are spaced evenly across the range of human hearing then the SMR will function like a graphic EQ If the bands are rotated or swept up and down in fre...

Page 11: ...tive in the range of 0V to 5V so each rotation step has a window of 0 25V Applying 0 25V will cause the channels to rotate one step clockwise Dropping back to 0V will cause them to rotate back one step counter clockwise Applying 1 0V will result in the channels morphing four positions clockwise Dropping from 1 0V to 0 75V will cause them to rotate back one step This kind of rotation is different t...

Page 12: ...If you unlock that channel it will keep the same bank but when you change the bank again it will join the same bank as the rest of the unlocked channels Scale CV The scale can be changed via CV using the Scale CV jack Voltages in the range of 0 to 5V are accepted Since there are 11 scales in each bank a voltage increase of 0 45V causes all unlocked channels to move to the next scale Likewise a vol...

Page 13: ... the selected channels to invert their lock state Thus locked channels will unlock and unlocked channels will lock Q lock Q locking is an advanced feature that locks the channel s Q or resonance setting To Q lock a channel hold the Lock button down while you turn the RES Q knob When the RES Q knob is where you want the channel to be locked release the Lock button The Lock button will now flicker t...

Page 14: ...er LEDs do a sequential animation and the light ring slowly filling up with lights and then clearing then filling up again Do not interrupt the process You can monitor the audio by listening to the evens Lock jack or the audio OUT jacks 5 If at any time two of the Lock lights turn on channels 2 and 3 or channels 2 and 4 and the other lights stop animating then an error has occurred Verify the cabl...

Page 15: ...mount of red the second slider controls the amount of green and the third slider controls the amount of blue Billions of colors can be chosen with these three sliders When you find a color you like lock the channel and unlock the next channel you want to edit You also can edit multiple channels at once by unlocking them all while adjusting the sliders This is a quick way to set all the channels to...

Page 16: ...ntains intervals selected from Wendy Carlos s non octave repeating Gamma scale spanning roughly 20Hz to 20kHz 6 17 note per octave yellow The first scale starts at 13 75Hz and each note is equally tempered to a 17 note octave Each scale is one octave above the previous 7 Chromatic purple The first scale starts at E2 82 4Hz and each note is one semi tone above the previous Each scale spans an octav...

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