The SuperScales book includes 864 MIDI drone files — one for each combination of MMA mode, transposition, and practice context. These are not incidental accessories. The drone is the pedagogical anchor of the entire SuperScales ear training system: without a constant, accurate pitch reference, key center hearing cannot be developed. The 864 drones are the infrastructure that makes the SuperScales system practicable rather than merely theoretical.

Why One Drone Per Mode, Not Just Per Key

A key center drone for C stays on C regardless of which MMA mode is being practiced. So why 7 different drone files per key rather than one? The answer is that the drone file for each mode includes not just the root tone but mode-specific context: the characteristic intervals of the mode sounding as sustained tones underneath the practice melody, giving the ear an immediate reference for what the mode’s scale degrees sound like against the tonal center.

For the Lydian Dominant mode, the drone includes a soft #11 (F#) sounding alongside the root — so the student’s ear immediately hears the Lydian Dominant’s characteristic interval as part of the background. For the Altered scale, the drone includes the b9 and b13 as soft background tones alongside the root, giving the student an immediate sense of the Altered scale’s sound world before they play a single note of the exercise.

This mode-specific drone design is more sophisticated than a simple root tone, and it requires more production work — 7 distinct drone files per key rather than one. But it dramatically accelerates the ear training process: rather than asking the student to construct the mode’s sound world mentally from scratch with each practice session, the drone gives them the sound world immediately.

Drone Engineering Specifications

The Generation Pipeline

Each of the 864 drone files was generated using a SuperCollider script that synthesized the drone sound from scratch — no recorded audio, no samples. SuperCollider’s additive synthesis allowed precise control of the timbre: the root tone was a combination of the fundamental and a carefully attenuated second harmonic, creating a full-bodied sound without the overtone density that would compete with the exercise material.

The mode-specific characteristic tones (the #11 for Lydian Dominant, the b9 and b13 for Altered, etc.) were synthesized at -12dB relative to the root — present enough to color the sound but not loud enough to interfere with recognition of the exercise material. The metronome click was synthesized as a short, spectrally bright burst (centered around 2kHz) that cut through the drone without masking it.

Python orchestrated the batch generation: one script looped through all 12 keys, all 7 modes, all tempo and register variants, called SuperCollider for each combination, captured the rendered audio, normalized it, converted it to MP3, and organized the output into folders by key and mode. Total generation time for all 864 files: approximately 6 hours of computer time, versus the weeks it would have taken to record each one manually.