Fennora: FM Patch Studio

Keep the original. Shape the next version.

Fennora is a local file workspace for classic six-operator DX7 voices. Open a single voice or a 32-voice SysEx bank, inspect the parameters, make deliberate changes and export files you can carry into your own workflow.

SIX OPERATORS, CLEARLY CONNECTED
See all six operator level schematics alongside frequency settings and output levels. Tap an operator to edit envelope rates and levels, frequency, detune, velocity response and keyboard scaling. Sliders provide quick changes; steppers let you choose exact values. iPad shows the overview and precision inspector side by side in a wide workspace.

KEEP A USEFUL HISTORY
The imported source stays untouched. Changes shows the exact original and edited parameter values for each slot. Save named voice versions and restore them later. Copy and paste operators, rename voices, replace slots or move them through a 32-voice bank. Add bank notes, duplicate banks and restore independent copies from backups.

CHECKED FILES, REAL OUTPUTS
Export the selected voice and, for a 32-slot bank, a complete bank. Fennora reads both generated SysEx files back and compares every parameter with the current values. Keep a byte-identical original, a restorable JSON backup, an all-bank changes CSV and a four-page selected-voice PDF. Share the files through the system share sheet or save them to Files.

ONE PURCHASE
No subscription, in-app purchases, account, advertising or analytics. Files and edits stay on your device unless you choose to share them. Your system backup settings still apply.

SUPPORTED SCOPE
Classic DX7 VCED single voices (163 bytes) and VMEM 32-voice banks (4,104 bytes). Framing, checksum, channel, parameter ranges and reserved bits are validated. Unsupported or damaged files are rejected rather than silently repaired. No ACED, performance, 4-op, ZIP, SMF or concatenated dumps. Voice names use 1–10 printable ASCII characters. Keep up to 24 banks and 64 named voice versions per bank; restore validated JSON files up to 2 MB.

Fennora is a file editor. It does not synthesize or audition sound, transmit MIDI, connect to hardware or display algorithm routing. Envelope curves show level stages, not seconds or rendered audio. Hardware behavior has not been verified; use your own compatible transfer software and check the receiving instrument's documentation.

Start with your own file, an initialized bank or an optional original parameter study. No factory voice library is bundled. Export backups before uninstalling.

Independent app by Gobling Company, not affiliated with Yamaha. DX7 identifies the supported file format.