The Quad LFO is the second in a series of modules that represents a new approach in User Interface design for Modcan modules. The intent is to combine multiple iterations of otherwise single module functions, in this case an LFO, into a high density module with large feature set that maximizes panel space and control hardware.

Features:

Outputs are 12bit and step free throughout 500Hz - 0.008Hz range

16 waves are available (see Quad LFO.pdf for full listing and graphic
for each wave). Unique Waves like Cosign random and Stair waves can be used to produce a complex modulation source

All waves have some form of transformation available. For some it is morphing between two waves, Pulse Width, Slew rate, Step size etc. The possibilities are virtually limitless when adding modulation to these basic shapes.

Four different Modulation destinations per LFO.

Three different Gate Modes per LFO.

Tempo Sync is available to set LFO Rate using a clock.

Three Global Modes of operation: Normal, Quadrature and Rotate.

Three Modes for output wave polarity. +/-5V, 0-5V+, Inverted.

Memory storage to save user configuration.

User Interface:
This design uses a "paging" interface with four individual LFOs that are edited a common set of 6 panel control knobs and 5 switches. A panel with 24 knobs and 60 switches would be required to access all patch parameters if using a traditional UI. The LFO EDIT knob selects one of four LFOs to edit. The knobs become "live" for that channel with the final edit settings stored to non-volatile internal EEprom memory. All settings are automatically restored on power up.

Three global modes of operation:
Normal - Each LFO is is edited individually. All Modulation routings and RESET options are controlled by panel switch settings and knobs and stored to memory.

Quadrature - Only one LFO is active but the other three outputs are 90,180,270 degrees out of phase with the primary out. This is great for quadraphonic panning using a 4VCA or Quad cross fading of four
signals. Can also be used to sequence envelopes and a variety of other unique patches.

Rotate - This mode rotates the 4 LFOs to the 4 outputs A pulse/clock train on the GATE IN jack increments the outputs one jack to the right with each new pulse. The LFOs can be edited and all modulation routings and settings are retained. The Status LEDs remain static to help with editing.
This can produce some truly chaotic patches with a vast array of modulation possibilities.

Modulation Destinations:
Each LFO has a CV input for modulation. The CV input is routed to the 4 modulation destination by the CV MOD switch. Destination are RATE, AMPLITUDE, TRANFORMATION and WAVE selection.
All 4 destinations can be assigned and used simultaneously on all 4 channels.

GATE MOD functions :
A unique set of functions is available using the GATE MOD input.
Only one GATE MOD setting is available per LFO.
None - Gate has no effect on channel
Reset - Gate high resets the LFO to start position 0
Hold - Gate high holds or freezes the current LFO wave state till goes low
resuming oscillation from the hold state.
Sync - Very unique feature that permits the user to synchronize LFO Rate to a clock or other LFO. This is a great method of keeping LFOs in sync with sequencers etc.