v2.5.0

Changes

• Use better footprints.
• Increase PCB edge clearance.
• Fix a freeze occurring when the TONE input drops below the lowest tonic of the selected scale, e.g. with a CV patched in and the TONE knob at its minimum.

Firmware

Achordion's firmware can be upgraded to obtain new features and bug-fixes. To do so, download the binary from attachments bellow, navigate to Electro-Smith's web programmer and follow the guide to upload the binary throught the "File Upload" tab.

Input quantization

By default, the input CV snaps to the closest note voltage. This works well with normal inputs or tones that are already quantized to the scale.

If you use a keyboard for CV source, consider trying the alternative firmare achordion-firmware-x.y.z-white-key-quantization.bin which maps white keys to all notes of the scale.

v2.4.0

Changes

• Quantize TONE input 1V/oct CV to the closest note. The original white key
  quantization is now available as an alternative firmware.

Firmware

Achordion's firmware can be upgraded to obtain new features and bug-fixes. To do so, download the achordion-firmware-2.4.0.bin binary from attachments bellow, navigate to Electro-Smith's web programmer and follow the guide to upload the binary through the "File Upload" tab.

Input quantization

By default, the input CV snaps to the closest note voltage. This works well with normal inputs or tones that are already quantized to the scale.

If you use a keyboard for CV source, consider trying the alternative firmare achordion-firmware-x.y.z-white-key-quantization.bin which maps white keys to all notes of the scale.

v2.3.0

Changes

• Introduce basic detune to the first detune section.
• Tune the output to match 440 Hz at A.
• Fix 1V/oct alignment of unquantized solo voice output.
• Move Pure Data externals to a dedicated project.
• Offer alternative firmware with white key quantization disabled.

Firmware

Achordion's firmware can be upgraded to obtain new features and bug-fixes. To do so, download the binary from attachments bellow, navigate to Electro-Smith's web programmer and follow the guide to upload the binary throught the "File Upload" tab.

Known issues

Due to white key quantization, the module is quite sensitive to inaccurate CV input of TONE. This is especially notable when the same CV is simultaneously used to control the pitch of another module as well. If you suffer from these issues, try the alternative firmware achordion-firmware-x.y.z-even-quantization.bin.

v2.2.1

Changes

• Split modal playing control to bind mode and scale CVs separately.
• Shift the range of TONE' by 2 octaves higher.
• Fix scaling of scale tonic CV to properly track 1V/oct.
• Persist tonic configuration between restarts.

Firmware

Achordion's firmware can be upgraded to obtain new features and bug-fixes. To do so, download the binary from attachments bellow, navigate to Electro-Smith's web programmer and follow the guide described under the "Display Help" button.

v2.2.0

Changes

• Blink the signal LED twice to signalize new version.
• Add harmonic minor mode.
• Introduce configuration menu.
• Allow remapping of CV inputs to control scale's tonic and mode.
• Enable overdrive through the configuration menu.
• Order of modes can be changed in the configuration menu.
• Extend the build manual with additional notes.
• Update pictures in the build manual to match version 2.

Firmware

Achordion's firmware can be upgraded to obtain new features and bug-fixes. To do so, download the binary from attachments bellow, navigate to Electro-Smith's web programmer and follow the guide described under the "Display Help" button.

v2.1.0

• Introduce togglable overdrive mode, compensating for big headroom.
• Add tooling holes to the PCB.
• Adjust V/oct response to reflect the new voltage range.
• Fix contents of each TONE output.

v2.0.0

• Replace Daisy Seed with Daisy Patch Submodule, to assure CE requirements.
• Switch to 0805 footprints for easier hand-soldering.
• Change from 3 board to 2 board design to become skiff friendly.
• Remove debug pins due to lack of I/O.
• Prevent flash memory from getting worn out by utilizing its full range, saving only on change and increasing the backup interval.
• Blink the on-board LED every 2 seconds to indicate that the firmware is running.

v1.3.1

• Fix english, change "unisono" to "unison".
• Disable line voice when its V/OCT input gets below zero.
• Fix a regression where the module would not fade in on boot.
• Document current requirements.

v1.3.0

• Introduce documentation of the build process.
• Remove amplitude balancing on small chords. This causes weak signal output but guarantees stable loudness on continuous tones.
• Adjust solo and chord V/OCT tracking to react uniformly to input voltage.
• Avoid pops on chord changes by increasing the fade-in/out time of individual oscillators to 3 ms.

v1.2.0

• Add mounting holes for distancing standoffs.
• Label boards and their sides to allow clear identification while building.
• Make it possible to disable quantization on the side line.
• Divide each octave V/OCT input to 7 almost equal sections.
• Document the depth of the module.
• Fully utilize the display while indicating the chord mode.
• Introduce V/OCT control of chords.
• Change CV range for chords to 0-10V.
• Improve the amplitude balance between low and high number of voices.
• Fix a bug where uninitialized voices would cause bit noise.
• Send solo output to SOLO' jack, as written in the documentation.
• Decrease the brightness of LEDs.