# Piano audio attribution Salamander Grand Piano V3 by Alexander Holm. Source recording: https://github.com/sfzinstruments/SalamanderGrandPiano License: Creative Commons Attribution 3.0 Unported, https://creativecommons.org/licenses/by/3.0/ These files are a subset of the MP3-format sample copies published by Tone.js at https://tonejs.github.io/audio/salamander/. The app plays them at different pitches and applies a short gain envelope. The attribution does not imply endorsement by the original creator. # Black And Green Guitars Black Höfner Club and Green Gretsch Anniversary samples from Karoryfer Black And Green Guitars, recorded by Brian Wood. Copyright 2022 Karoryfer Lecolds. Released under CC0 1.0 Universal. Library: https://shop.karoryfer.com/pages/free-black-and-green-guitars Source: https://github.com/sfzinstruments/karoryfer.black-and-green-guitars Source commit: b3b3249d37dc977a1a297bd2dc053e6d9b6b805c License: https://creativecommons.org/publicdomain/zero/1.0/ The website uses medium-velocity clean/twang plucks with two alternate takes per note, MIDI 40–78, converted from the original 24-bit WAV recordings into MP3 VBR quality 2. Sample pitches follow the original SFZ maps; filename octave names are not interpreted as MIDI octaves. The player adds guitar chord voicings, strum offsets, and gentle clean speaker EQ. It does not reproduce the library's full SFZ GUI, feedback, effects, or other articulations. Each guitar's sample directory contains the original license and SOURCE.json documenting the selected source recordings and processing. # Martin HD-28 acoustic guitar Martin HD-28 samples recorded by Jeff Learman for Kinwie's Discord SFZ GM Bank. The original instrument header explicitly releases the samples under Creative Commons CC0. This is a third-party recording library, not a Martin-sponsored product. Source: https://github.com/sfzinstruments/Discord-SFZ-GM-Bank/tree/2b58d62da87d9cf16dcb6299abd1d298b67bfc4b/Discord%20GM/Melodic/026-Acoustic%20Guitar%20(steel) Source commit: 2b58d62da87d9cf16dcb6299abd1d298b67bfc4b License: https://creativecommons.org/publicdomain/zero/1.0/ Fifteen original 44.1 kHz mono 16-bit WAV files, MIDI 40–83, copied without audio modifications. Each note uses its nearest recorded pitch (at most two semitones across the supported guitar range). There is one recorded take per sampled pitch. The app adds playable guitar chord voicings, staggered strum timing and a release envelope, and bypasses the electric-guitar speaker EQ. It does not emulate the original SFZ's optional filters or sustain loops. The independent chord-volume control and shared output compressor still apply. `martin-guitar/ORIGINAL.sfz`, `LICENSE.txt` and `SOURCE.json` retain the license evidence, pinned source, file names and SHA-256 hashes. The recordings used in the approved acoustic audition match these bundled originals byte-for-byte. # Acoustic drums Virtuosity Drums by Versilian Studios and Karoryfer Samples, performed by Austin McMahon, recorded at Virtuosity Musical Instruments in Boston. CC0 1.0 Universal. Source: https://github.com/sfzinstruments/virtuosity_drums Source commit: 9f04cf9a734527edfbb0a4eee1f674e45bbf71bc License: https://creativecommons.org/publicdomain/zero/1.0/ The app uses fourteen selected kick, snare, soft snare, closed hi-hat, pedal hi-hat, ride, and cross-stick recordings. Kick/snare use their close microphones; cymbals use overhead microphones. Each recording is peak-normalized to -3 dBFS and converted from FLAC to MP3 VBR quality 2. Two recorded variants alternate for each voice. Original recordings retain their natural decay. Rock, Blues, Jazz and Country are simple programmed grooves using this acoustic kit, not four separate sample libraries. SOURCE.json lists every source file and gain adjustment; LICENSE.txt retains the original license. # Black and Blue basses Black And Blue Basses by Karoryfer Samples. Black is a finger-played hollowbody five-string bass; Blue is a pick-played solidbody five-string bass. Library: https://shop.karoryfer.com/pages/free-black-and-blue-basses Source: https://github.com/sfzinstruments/karoryfer.black-and-blue-basses Source commit: 6e7d674cdb41be7a54dbccb15472401ad01099b9 License: CC0 1.0 Universal, https://creativecommons.org/publicdomain/zero/1.0/ Selected center-map regular plucks (Black mf, Blue f), two takes per pitch. Electric bass SFZ maps use written pitches one octave above the recordings: MIDI sample references are corrected down twelve semitones to their sounding pitches. Period measurements of the A2-mapped recordings confirmed an A1 fundamental near 55 Hz. Included sounding pitches span MIDI 28–46. Converted to MP3 VBR quality 2 with original recording levels, maximum four-second natural tails, and a 100 ms fade at the truncation point. Playback adds a short note-release envelope and a 30 Hz rumble filter. No synth doubling, distortion, library GUI, or unison effects are used. # Upright bass Meatbass by Karoryfer Samples: recordings of a 1958 Otto Rubner acoustic double bass. Library: https://shop.karoryfer.com/pages/free-meatbass Source: https://github.com/sfzinstruments/karoryfer.meatbass Source commit: ac9e859564bda286ab5ec672d00ff1aa2fef2895 License: CC0 1.0 Universal, https://creativecommons.org/publicdomain/zero/1.0/ Selected pizzicato (plucked) velocity layer 3, two takes per sampled pitch, MIDI 27–48 at minor-third spacing. Sounding references follow the original SFZ maps; intervening notes shift at most one semitone. MP3 conversion, tail limits, and playback processing match the electric basses. Each bass directory retains its original LICENSE.txt and SOURCE.json with all source files and pitch mappings. Credits do not imply endorsement. # FreePats jazz guitar FSBS Electric Guitar Clean #2 (Jazz), small bridge bank, version 2026-08-07. Sampled Fender guitar processed through an amplifier/effects rack by FreePats. Library: https://freepats.zenvoid.org/ElectricGuitar/clean-electric-guitar.html Source: https://github.com/freepats/electric-guitar-FSBS-jazz License: CC0 1.0 Universal. Original license, README, SFZ and sample hashes retained under freepats-jazz/. Thirteen original FLAC recordings decoded to canonical 16-bit PCM WAV without normalization, trimming or additional EQ. SFZ sustain loops apply to seven lower samples; upper notes retain natural decay. Existing guitar voicings, strums and playback envelopes apply. Loads only when selected.