Sequencer: The EA-1 is a two track sequencer with 64 steps. Each sequencer track is one MIDI channel wide. Each track operates on its own MIDI channel.
There are a pair of independent monophonic synthesizer engines, one synthesizer engine per sequencer track. Thus, each engine has its own MIDI channel and it's own sequencer.
The combination of track and synth engine is called a Part. So there are two parts: Part 1 and Part 2. They are identical. Except each comes out of a separate 1/4" jack on the back.
Each track can store a motion sequence a single synthesizer parameter from the Oscillator or Filter block of each engine. It can also store motion sequences for the effects block of each synthesizer engine.
Synth Engine: The synth engine has two oscillators:.Oscillator 1 (OSC1) and Osciallator 2 (OSC2). OSC1 and OSC2 are not identical.
OSC1 has four wave shapes: saw, square, triangle, and Audio In (more about Audio In later). It does not have modulation.
OSC2 has only three wave shapes: saw, square, triangle.. It has three OSC Mod's (modulations): Ring, Sync and Deci (for decimator), The modulation can be turned off.
Each engine has it's own filter section. The filter is low pass with resonance.
Each engine has it's own Amp envelope with a combined attack+decay knob (EG Int) and a dedicated release knob labeled Decay. It's called "decay" but it effects the release phase of a typical ADSR envelope.
Each engine has it's own effects section with two effects. There's a signal flow diagram on the EA-1's playing surface, but it doesn't go into these details.