Freq & Chords Page
The top-level page is a status screen which shows all 4 VCOs and their settings as they relate to ‘traditional’ VCOs.
The displayed parameters are individually set by highlighting the VCO you want to edit, clicking, and going to the
second page (middle photo). The following is a list of the parameters you can select for each VCO. Note that some
these parameters have “no meaning” if that VCO is a noise generator (such as FM TYPE).
Rng/Frequency Range: High (10Hz – 10Khz), Med (0.15Hz to 160Hz) and Low (1 cycle in 14min to 1Hz)
Qnt/Quantize: whole tone equal temperament quantizer on/off
Quantize offset: can offset the overall scale, in increments of +- 3 cents. (roughly -100 to +100 cents)
FMQ/FM Quantize: the FM input does not have to be quantized (for pitch bending, etc), but it can be.
FMT/FM Type: sets Exponential or linear TZFM (Thru-Zero FM). In Linear, there are 3 ranges for the sensitivity of the
FM CV applied (L/M/H for low range, medium range and high range). Please note that there will always be a small
frequency ‘jump’/offset when switching from Expo to a Linear mode, and the ‘wider’ the FM depth, the larger the
offset. Such is the nature of things.
1VO/1V/Oct Source: you can assign any of the 4 1V/Oct summers (FINE+the CV on the 1V/OCT jack) or 1
of the 4 Chord tables. If you want to use the Chord Mode (below), you select it here.
FM/FM Source: selects what drives this VCO’s FM response (FM1 – FM4 CV input jack)
SYN/Sync Source: selects what drives the SYNC for the VCO (not for the Sample Player or Chord), jacks SYNC1-4
Calibration
: if you need to over-ride the factory 1V/Oct tracking for the 4 VCOs, this takes you to a page to
reprogram. Each VCO is calibrated individually. The calibration does not use traditional ‘trim pots’, rather a software
routine reads and stores the calibration into the internal EEPROM memory. Be SURE the VCO to be calibrated is in
EXPO mode (you cannot calibrate in a Linear mode) with Phase Interpolation set to ON. Follow the screen prompts:
you send a 1V change and the E370 calculates a proper octave and saves the data. Playing 1 octave apart via a MIDI-
CV converter and keyboard is the easiest method. The calibration range is ~0.5V to 1.5V/Oct. Calibration data is not
saved in presets.
Chord Mode
Chord Mode uses a table of pre-programmed
frequency offsets
to control the E370 globally (Chord mode over-rides all
other modes). There are 4 pre-programmed factory chord tables (ROM1-4), or you can load your own tables (USR1-4)
with the uSD card and a plain text file.
Each Chord table can be up to 64 entries in length. Each entry (line of text) contains 4 numbers separated by a space.
The numbers are the frequency offset, in semitones, from what we call the ‘root frequency’. The root is set in the
menu as the ‘master’ 1V/Oct source. In the example shown (ROM1), this is set to IN1. What is meant by IN1? This is
the summation of VCO1’s COARSE, FINE and 1V/OCT input CV jack.
