Sympatheia Part 4: Programming a Session

One thing that separated the Monroe Institute's work from everything else in this space was that they didn't just pick a frequency and play it. They built sessions: staged progressions that moved you through a sequence of states, each one building on the last. The Gateway Experience recordings are arc-designed. They have openings and departures and returns. Something about that structure — the sense of being guided through territory rather than parked in a frequency — makes the experience qualitatively different.

We're not trying to re-create the Gateway Experience here though - that is an entire system of intention based tools, imaginal practices, guided meditations, and specific techniques to get you into the proper state to know that you are "more than your physical body" ^[1]. The Monroe institute spent a lot of time to develop this system - it's not going to be replaced by a set of binaural beat FLACs or a tool like this.

People often get caught up with the "tapes", specific "focus levels", and the like. These were Monroe's inventions - internally consistent with the experiences at the time -- adoptable, but not univerally absolute in the ontological sense.

Sympatheia's sequencer was built for self-directed work along these lines. The assumption is that you know where you want to go and what you want to do, or at least that you want to play to find out what happens. Tom Campbell would say you need your own TOE (theory of everything). Sympatheia is just one tool to help generate, or find, one.

The step editor

A program is a list of steps. Each step specifies four things: where you want to be (beat frequency and carrier), how long the transition takes (the ramp), and how long you hold once you arrive.

Beat and Carrier are the target values for this step. At the end of the ramp, the oscillators will be at these exact frequencies.

Ramp is how long the transition takes in seconds. Set it to zero and the change is instant; set it to 180 and you have a three-minute glide. The ramp uses linear interpolation on the AudioParam level, so the binaural oscillators, the ISO AM oscillator, and the pads tremolo all move together continuously rather than stepping in increments.

Hold is how long to stay at the target once the ramp completes, before the next step's ramp begins.

The total duration of a step is ramp plus hold. A step with a 120-second ramp and a 300-second hold occupies 420 seconds. The sequencer calculates the total session length automatically and sets the session timer accordingly.

Add steps with the + button. Drag to reorder. The step count isn't limited in any meaningful way, though a session longer than a couple of hours is probably asking more of the battery than the brain.

Tone cues

Each step can carry a list of tone cues: tones that fire at specific moments relative to the start of that step.

A tone cue has three fields. Hz is the frequency, same values as the tone palette in Part 3. At is the offset in seconds from the beginning of the step (ramp included). ADSR is an optional override of the default envelope, useful for cues that need a different character from the session baseline.

The cue timing is relative, not absolute. A cue with at: 60 fires 60 seconds into its step, regardless of where in the total session that step falls. This makes it easy to reason about what happens within each step without tracking global timestamps.

A few practical patterns:

An opening cue fired at 5 seconds into the first step functions as a soft start signal. The tone arrives before the session has fully settled, announces itself, and fades out before you're deep enough that you'd prefer silence.

A cue in the middle of a long hold, timed around the midpoint, serves as a quiet check-in tone. You don't notice it consciously half the time. The other half it arrives as a small event that anchors attention back to the session without dragging it back.

Cues during a ramp feel different from cues during a hold. During a ramp the sonic environment is already in motion; a tone firing into movement sits differently than a tone that arrives in a stable field.

Per-step mixing

Steps can also carry volume changes and channel on/off toggles that take effect when the step begins.

This is how you build a session that evolves in texture over time, not just frequency. Bring the ocean up slightly at a particular step. Fade tones to near-zero during a deep delta hold. Restore them as the session comes back up. The Chakra Bowl uses this for one specific effect: the ocean swell increases at the heart chakra step and returns to normal at crown. Nothing dramatic. Just enough to change the character of that particular moment.

Channel-level changes restore automatically when the sequence ends, so changes made mid-session don't carry over to your manual settings.

The library

Built-in programs live in the library panel under the Sequences tab. User-saved programs appear below them.

Built-in programs load both the step sequence and a full mixer snapshot, so they arrive with carrier drift, reverb, layer settings, and channel states all set. If you want to hear what a session is supposed to sound like before you modify it, load it from the library rather than building it from scratch.

Programs can be exported as JSON and imported back. There's also a share link: the full program state encodes into the URL, which you can send to someone else or bookmark for yourself. The URL is decoded on load, so a bookmarked session opens exactly where you left it, settings and all.

Chakra Bowl: a worked session

The Chakra Bowl is the most fully realized built-in program. Worth looking at in detail because most of the design decisions in it generalize.

Seven steps, 28 minutes total. Each step is 240 seconds: a 60-second ramp followed by a 180-second hold. Each step corresponds to one chakra and one solfeggio frequency.

The frequency arc does not move monotonically downward. It starts at 10 Hz alpha (Root), descends through 8.5 (Sacral), reaches the Schumann resonance (7.83) at Solar Plexus, dips to 6.5 Hz theta at Heart (the deepest point), returns to Schumann at Throat, stays at 8.5 at Third Eye, and closes at 10.5 at Crown. The arc is shaped. It goes somewhere and comes back, slightly elevated from where it started. That structure is intentional.

Carrier and bass alignment. For each step, the binaural carrier is set to the chakra frequency divided by 2 (one octave below the bowl tone), and the sub-bass is set to the chakra frequency divided by 8 (three octaves below). So at the Heart step, the bowl tone is 639 Hz, the binaural carrier is 213 Hz, and the sub-bass is 40 Hz. The three frequencies are all harmonically related. Whether or not this produces a measurable physical effect, it means the sonic environment is internally consistent. Everything is pointing at the same pitch class.

Three-tone pattern per step. Each step carries three tone cues in sequence:

1. A bowl drone that starts at t=5 (5 seconds into the step, during the ramp). Long attack, 160-second hold, 30-second release. This tone starts while the binaural frequencies are still moving and blooms fully into the hold. By the time the ramp ends the bowl is already established.
2. An arrival bell at t=65 (5 seconds after the ramp completes). Near-instant attack, fast decay. Marks the moment of arrival at the new chakra. In Bowl character, a fast-attack tone sounds like a struck bowl rather than a bowed one.
3. A warm swell at t=80. Slower attack. Harmonics. The step is now settled; this tone adds presence and fills out the upper register before fading.

The first step (Root) has a slightly different structure because there's no ramp. The bowl drone starts at t=15 after a brief silence, and the timing shifts accordingly.

At the Heart step there's a fourth cue: a Cosmos (432 Hz) warm swell at t=140, arriving late in the hold. 432 Hz is not the heart frequency, but it layers naturally with 639 Hz in a way that's particularly open-sounding. It was in the design from the start as a small moment of something broader in the middle of the deepest step.

Session Bells. Enable the checkbox in the options row before running Chakra Bowl. Three struck-bowl tones at 432 Hz open the session; three more close it. These arrive outside the step sequence, before the first ramp starts and after the last hold ends. The opening bells give you a moment to settle. The closing bells signal that the session has finished before the audio fades completely. Without them the ending can feel abrupt.

Built-in programs

Several other programs are worth mentioning:

Hypnagogic Edge (30 min) works the theta-delta boundary. It enters at alpha, descends to theta, touches delta, recovers, and settles at 4 Hz for the final hold. The design intent is to stay in the hypnagogic zone without dropping fully into sleep.

Sleep Threshold (90 min) runs two full descent cycles, going deeper on the second. The first reaches 3.5 Hz delta; the second reaches 1.5 Hz. It's a long program, designed for lying down in shavasana.

Focus 10 is named after the Monroe Institute state of the same name: mind awake, body asleep. It moves from alpha through 7.83 Hz and holds there. Binaural volume is higher than usual by design, because maintaining the mental thread at the alpha-theta border requires the beat to be audible.

How I use the sequencer

I've built in advance, and stored as Sympatheia programs most of the sequences that I want to use, so at this point, I'm using mostly pre-sequenced sessions. I am guessing that if you've read this far, and have used Sympatheia a bit, this will be the case for you too - you'll come up with programs meaningful to you, and will re-use them for various purposes. Be sure to export and save the JSON files for your sequences in case your browser-based storage gets reset. This program doesn't talk to any server, and all personal sessions are yours alone (unless you share them).

The Hypnagogic Edge program I use more often than the others. The arc from alpha through theta and back has a shape that matches what a good sit naturally does, and having the audio mirror that shape provides something to synchronize with. Whether that's placebo, brainwave entrainment, or just Pavlovian conditioning from enough sessions, it works.

What's next

Part 5 is the pads channel. Sustained harmonic chord progressions that flow beneath everything else, with mode-based movements, voice leading, and the tremolo sync that ties the pads rhythm directly to the entrainment frequency.