Using Orphere to Design Progressions in Time: Sections, Pulse Units, and Region Duration

A progression in Orphere is more than a flat list of chords. It is a structured map of your harmonic plan, organised into sections that reflect how you actually think about your music. This post walks through how to use sections, pulse units, and region durations to design progressions that are clear, flexible, and useful.

Sections: the containers

A section is a labelled group of regions. You might call one “Intro,” another “Verse,” another “Bridge.” Each section holds its own sequence of regions, and the regions within a section flow in order.

Sections don’t have to represent parts of a form that appear one after another. A section could be a theme (“Love Theme,” “Antagonist Motif”), a cue point (“Hit: Door Slam,” “Transition to Scene 12”), or any other grouping that makes sense for your project. You decide what a section means. Orphere just gives you the container.

You can add, remove, rename, reorder, and collapse sections. Drag a section header to move it. Click the label to rename it. Regions can be dragged between sections, so your structure can evolve as your ideas develop.

Sections for film scoring

Film composers often work with hit points, specific moments in a scene where the music needs to land. Each hit point can be its own section. The regions inside that section describe the harmonic approach leading up to and through the hit. This way, your progression map mirrors your spotting notes rather than forcing everything into a single linear timeline.

You might also use sections to separate thematic material. One section holds the main theme’s harmonic skeleton. Another holds a variation or development of that theme. A third holds a contrasting idea. When you need to compare or combine them later, everything is labelled and accessible.

Sections for songwriting

For songwriters, sections map naturally to the parts of a song: Verse, Pre-Chorus, Chorus, Bridge, Outro. Each section contains the harmonic regions for that part. If your chorus uses the same four chords every time, that’s one section with four regions. If you want to experiment with a reharmonised version, duplicate the section and edit the copy.

Sections for analysis

When analysing an existing piece, sections let you break the score into meaningful segments. You might label them by rehearsal marks, by formal sections (Exposition, Development, Recapitulation), or by scene if you’re analysing a film cue. Each section then holds the regions you’ve identified from the score, giving you a structured reference you can inspect, compare, and revisit.

Pulse units: the grid

Each section has a pulse unit, which defines what one “pulse” means in terms of rhythmic duration. The available pulse units are:

• Sixteenth note (1/16)
• Eighth note (1/8)
• Quarter note (1/4)
• Half note (1/2)

The pulse unit is set at the section level, so different sections can use different grids. A fast-moving introduction might use eighth notes as its pulse, while a slow chorale section might use half notes.

Why pulses instead of bars?

Bars imply a fixed metre, but in practice, metre changes frequently. A film cue might shift from 4/4 to 3/4 to 5/4 across a single scene to follow the dramatic pacing. A concert piece might alternate irregular metres throughout a development section. If your harmonic plan is locked to bars, every metre change forces you to recalculate durations.

Within a given section, the denominator of the time signature, the pulse unit, tends to stay constant. It’s the numerator that changes: how many pulses are grouped into each bar. A section in quarter notes might move from 4/4 to 3/4 to 5/4, but the quarter note itself remains the underlying pulse throughout.

This is exactly why Orphere works at the pulse level. You set the pulse unit once per section, then express each region’s duration as a number of those pulses. A region that lasts 6 quarter-note pulses works whether your bar is 4/4, 3/4, or 6/4. The grouping into bars is a decision you make later in your DAW or notation software, where you can draw barlines however the music demands. Orphere stays at the pulse level so your harmonic planning isn’t coupled to metrical decisions that may still be in flux.

The pulse unit also doesn’t set a tempo. Orphere doesn’t work with BPM or a metronome. Instead, the pulse unit gives you a relative grid, a way to express how long each region lasts in musical terms. How fast a quarter note actually is depends on your score, your DAW, or your performers. Orphere just tracks the proportions.

You can change the pulse unit for a section at any time using the dropdown in the section header. Scroll the mouse wheel over it to cycle through options quickly.

Region duration: how long each region lasts

Every region has a pulse count, the number of pulses it occupies. If your section’s pulse unit is a quarter note and a region has a pulse count of 4, that region lasts four quarter notes, or one bar in 4/4 time. If the pulse unit is an eighth note and the count is 6, the region spans six eighth notes, or three quarter note beats.

The pulse count can range from 0.5 to 16, allowing for anything from a brief passing harmony to a sustained pedal. You can adjust it using the dropdown on each region row, or scroll the mouse wheel over the count to nudge it up or down.

The pulse badge

Each region row displays a pulse badge on its drag handle. This number shows the cumulative pulse position where that region starts within its section, beginning from 1. If the first region has a count of 4 and the second has a count of 2, their badges read 1 and 5: the first region starts at pulse 1, the second starts at pulse 5.

This gives you a quick timeline-like reference without needing a literal timeline. You can see at a glance where each region sits relative to the others. When you drag regions to reorder them or change a pulse count, the badges update automatically.

Putting it together

Here’s a practical example. Imagine you’re scoring a short scene with two distinct moments: a quiet opening and a dramatic reveal.

1. Create two sections. Name them “Quiet Opening” and “Reveal.”
2. Set the pulse units. The opening is slow and sustained, so set its pulse unit to half notes. The reveal is rhythmically active, so use quarter notes.
3. Add regions to each section. The quiet opening might have three regions: a tonic pedal lasting 8 half-note pulses, a subdominant shift for 4 pulses, and a return to tonic for 4 pulses. The reveal might have faster harmonic rhythm: four regions of 2 quarter-note pulses each, followed by a longer landing region of 4 pulses.
4. Track a property. Select a property from the builder toolbar, such as brightness or chord roman numeral, and watch how it changes across your regions. This helps you verify that the harmonic arc matches your dramatic intent.
5. Load and inspect. Click the A or B button on any region row to load it into a slot. From there, you can inspect its properties in detail, compare it with another region, or use the palette to find alternatives.

The structure you build in the progression map translates directly to your DAW or notation software. Each section tells you what harmonic material to write, and the pulse counts tell you how long each harmony should last. Orphere handles the planning; you handle the realisation.

Summary

Sections give you labelled, reorderable containers for grouping regions by theme, cue, or form. Pulse units set the rhythmic grid for each section independently. Pulse counts determine how long each region lasts within that grid. Together, they let you design progressions that reflect how you actually think about your music, whether you’re composing, scoring to picture, or analysing an existing work.