Elektron Tonverk Preset: the category and the tags are ones the Tonverk knows

[douglas-carmichael]

Converted Tonverk presets did not show up in the preset menu of the device. The creator copied the category and the keywords of the source into the preset - e.g. category = 'Bell', category = 'Chromatic Percussion', tags = ['analog', 'poly'] - and left out the tags entry when there were no keywords. The Tonverk has two main categories, DRUMS and KEYS, which the CATEGORY filter of the LOAD PRESET menu uses (manual OS 1.4.0, 9.1.4 PRESET), and a fixed set of upper-case tags. The 175 presets of the factory library use only DRUMS, KEYS or no category, and only upper-case tags from that set. Across the factory library and the commercial packs I checked (Offworld Tapes, Rephazer Toneworld 1-3, EOH, Dissolve), every one of the 625 presets has a tags entry, if need be tags = []. Apart from Offworld Tapes, which also uses the tags PAD, BASS and LEAD as categories, none of them has a category other than DRUMS or KEYS.

Changes

• New TonverkTags maps the metadata of the model onto that vocabulary:
  • Category: DRUMS when the preset is written as a drum kit or the source category is a drum category (Drum, Acoustic Drum, Kick, Snare, Hi-Hat, Clap, Percussion, or DRUMS from a Tonverk source), KEYS otherwise.
  • Tags: the source category and keywords which match one of the 28 tags of the factory library, ignoring the case, plus a few synonyms (FX as SOUND FX, Loops as LOOP, arp/arpeggiated as ARPEGGIO, atmo as ATMOSPHERIC). Everything else is left out. The tags are sorted alphabetically, as the factory presets store them.
• TonverkPresetFile.write always writes the tags entry, tags = [] when it is empty.
• README-FORMATS: the Tonverk preset section still described the earlier output layout (samples next to the preset, referenced by a relative name). It now describes the SD-card layout which the creator writes, and the category and tag mapping.

Verification

• Michael Oakley's TAL-Sampler pack (32 presets), re-converted with the same settings: all 93 WAV files are byte-identical to the previous output, and the .tvpst files differ only in category and tags (now 32 × KEYS; tags BASS ×3, SOUND FX ×3, STRINGS ×2, BRASS ×1, the others tags = []). All 32 parse as TOML and read back with the Tonverk preset detector.
• Tonverk to Tonverk round trip of 7 factory presets covering the Multi, Drum and One-Shot machines with KEYS, DRUMS and no category, with the output engine set to Multi and to Auto: the tags are kept exactly, DRUMS and KEYS are kept, and presets without a category become KEYS (DRUMS for drums).
• Built on main 31b0f8a.
• On the device, the re-converted presets now show up in the preset menu, which none of them did before; 24 of the 32 load. The other 8 cannot be loaded because of their loops, which Elektron Tonverk: loops are written as the Tonverk loads them #491 fixes.