Session 01: Orientation & First Sound

Objective: Learn what a semi-modular synthesizer is, connect your Cascadia, and hear its normalled default sound so you have a reliable starting point for every future session.

What Is a Semi-Modular Synthesizer?

A modular synthesizer is a collection of independent modules -- oscillators, filters, amplifiers, envelopes -- connected by patch cables. You decide what goes where. A semi-modular synthesizer is the same thing, but with a twist: the manufacturer has pre-wired a default signal path between modules using internal connections called normals. You get a complete, playable instrument with zero cables. Every cable you add overrides one of these normalled connections, replacing the default routing with your own.

This means a semi-modular gives you two instruments in one. Without cables, it behaves like a fixed-architecture synth with a specific sound character. With cables, it becomes a fully patchable modular system where you decide the signal flow. The Cascadia's normalled path runs from oscillator through mixer, filter, wave folder, and amplifier to the output -- a complete subtractive/waveshaping voice that plays with zero patches but rewards every cable you add.

Warm-Up (2 min)

This is your first session -- no warm-up needed. We will start by connecting the instrument.

Setup

1. Connect a MIDI keyboard or controller to Cascadia's rear panel MIDI IN (5-pin DIN) or USB MIDI port
2. Connect Cascadia's rear panel MAIN OUT (1/4" jack) to your mixer, audio interface, or headphones via the rear panel PHONES OUT
3. Power on the Cascadia
4. Set MAIN LEVEL on the Output Control section to ~50%
5. Set MAIN DRIVE on Output Control to ~50% (noon)
6. Make sure all cables are removed from the front panel -- we want the pure normalled default

Exercises

Exercise 1: Hear the Normalled Default (5 min)

Play a note on your MIDI controller. You should hear a bright, buzzy sawtooth tone that responds to the keyboard -- higher notes are higher pitched, lower notes are lower.

1. Play and hold a note in the middle of your keyboard -- you should hear a sustained sawtooth tone
2. Play short, staccato notes -- the notes should start and stop cleanly with each key press
3. Play notes across the full range of your keyboard -- pitch should track accurately from low to high

Exercise 2: Trace the Signal Path (8 min)

Now that you hear the default sound, let's understand what is making it. The sound travels through these modules in order, all via normalled connections:

1. While holding a note, slowly raise the Mixer SAW slider from 0% to ~75% -- you should hear the sawtooth get louder as you increase its level in the mix
2. Now lower SAW back to ~50% and raise the Mixer PULSE slider to ~50% -- you should hear a thinner, hollower tone blend in alongside the saw
3. Lower PULSE back to 0%. Slowly move the VCF FREQ slider from ~75% down to ~25% -- you should hear the brightness of the sound reduce as the filter closes, making it duller and darker
4. Return VCF FREQ to ~75%. Raise the Wave Folder FOLD slider from 0% to ~50% -- you should hear new harmonics appear as the waveform is folded, creating a metallic, complex tone

5. Return FOLD to 0% and all other knobs to their starting positions

Exercise 3: Identify the Modulation (5 min)

The default sound is not just an oscillator through a filter -- two envelope generators are shaping it automatically.

1. Play a note and listen for any brightness change over time -- you may hear a subtle envelope sweep as the note sounds and decays
2. Raise the VCF FM 1 slider to ~75% -- now play a note. You should hear a more pronounced filter sweep: the sound starts bright and gets darker as Envelope B's decay stage completes
3. Return VCF FM 1 to ~25%. Play a low note, then a high note -- the high note should sound brighter due to keyboard tracking via FM 2
4. Return all sliders to their starting positions

Exploration (optional, hyperfocus days)

• Raise the Mixer SUB slider to ~50% and toggle the SUB TYPE switch between the three positions -- listen to how the sub-oscillator fattens the sound at different octaves
• Try the Mixer NOISE slider at ~25% with different NOISE TYPE switch positions -- hear how noise adds breath and texture
• Raise VCA A's LEVEL slider to ~50% to add a constant base volume, then play notes -- the envelope adds volume on top of this base

Output Checklist

• Can hear the normalled default sound when playing MIDI notes
• Understand that the signal path is: VCO A -> Mixer -> VCF -> Wave Folder -> VCA A -> Output
• Can name at least 3 normalled connections in the default signal path
• Session logged in Obsidian daily note

Key Takeaways

• The Cascadia plays with zero cables -- its normalled connections form a complete synthesizer voice
• Every cable you patch overrides one normalled connection, replacing the default routing with your choice
• The default sound is a sawtooth oscillator through a filter, wave folder, and amplitude envelope -- your starting point for every session

Next Session Preview

Next time you will explore pulse width modulation and the sub-oscillator -- two ways to thicken and animate the Cascadia's sound using the controls already normalled and ready to go.