The Little Phatty is a monophonic analog synthesizer, with 100 user editable presets.

Synth Engine:
Sound Sources are 2 ultra-stable analog VCOs. Parameters for the VCOs are:
-- Osc. 1 Octave: 16', 8', 4', 2'

-- Osc. 1 Wave: Continuously variable from triangle through saw and square to skinny pulse.

-- Osc. 1 Level

-- Glide Rate

-- Osc. 1 & 2 Sync On/Off

-- Osc. 2 Frequency

-- Osc. 2 Octave: 16', 8', 4', 2'

-- Osc. 2 Wave: Continuously variable from triangle through saw and square to skinny pulse.

-- Osc. 2 Level

-- Fine Tune (for both Oscillators, located at the bottom left of the panel)

Sound Modifiers include a single VCLPF: 24 dB /Oct Moog Ladder filter, with filter Overload control and a single Output VCA.
Filter parameters are:
-- Cutoff

-- Resonance

-- Kb. Control Amount (how much the Key CV modulates the Filter)

-- Filter Env. Amount (how much +/- the filter envelope modulates the filter)

-- Overload

An Envelope Generator section provides two ADSR EGRs: one to modulate the Filter (Filter EGR) and one to modulate the VCA (Volume EGR).
For each EGR, the parameters are:
-- Attack

-- Decay

-- Sustain

-- Release

The Modulation section contains a 4-waveform LFO, and a 1x1 Mod Buss with 6 possible mod sources and 4 possible destinations.
Its parameters are:
-- LFO Rate

-- Mod Source: (LFO triangle, LFO square, LFO sawtooth, LFO ramp, Filt. EGR, and Osc. 2

-- Mod Amount (the amount of modulation w/ the mod wheel all the way forward)

-- Mod Destination (Pitch, Osc. 2, Filter, Wave)

The User Iinterface (UI) section is described in the UI spec, below the LCD and UI controls are the following:
Performance controls:
-- 37-note keyboard

-- Spring-loaded pitch wheel

-- Mod Wheel

-- Glide On/Off

-- Octave Down

-- Octave Up

To the right of the front panel is the Output section. There is a Master Volume control, an Output On/Off switch, a Headphone Volume control, and a headphone output jack (1/4 in. TRS)

The side of the instrument houses the I/O of the instrument.
AC In (100-250VAC, 50-60 Hz)

Power On/Off

Audio Out

Ext. Audio In (accepts +4dBu line level signal)

Pitch CV In (1 V/Oct)

Filter CV In

Volume CV In

Keyboard Gate In

MIDI In

MIDI Out

Dimensions and Weight
26.75 in. X 14.75 in. X 6.75 in.

22 lbs

Basic Editing of sounds
Sound editing of continuous parameters (like Filter Cutoff) is done from the front panel by enabling a parameter with its switch (its LED becomes illuminated), and then adjusting its value control. There are 4 value controls, one for each section: Modulation, Oscillators, Filter, and Envelopes. Each is surrounded by a ring of 15 LEDs that show approximately the stored or edited value of the current parameter. The value controls are analog, and when a parameter is activated, the analog control signal is switched to directly control that parameter (RAC or Real Analog Control). For each section, only one continuous parameter can be activated at a time for editing. For parameters that have multiple possibilities (such as Mod Source) pressing that switch advances through the possible Mod sources. For On/Off type switches like Osc. Sync, the LEDs are On when that parameter is on or Off when the parameter is off.