{"id":23757081,"url":"https://github.com/mmitch/syndig","last_synced_at":"2025-09-05T04:31:25.401Z","repository":{"id":55099339,"uuid":"313016532","full_name":"mmitch/syndig","owner":"mmitch","description":"a simple software synthesizer in C","archived":false,"fork":false,"pushed_at":"2025-08-15T21:21:17.000Z","size":362,"stargazers_count":13,"open_issues_count":1,"forks_count":2,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-08-15T22:45:42.680Z","etag":null,"topics":["alsa","midi","pulseaudio","software-synthesizer","synthesizer"],"latest_commit_sha":null,"homepage":"","language":"C","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"gpl-3.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/mmitch.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null}},"created_at":"2020-11-15T11:30:40.000Z","updated_at":"2025-08-15T21:21:21.000Z","dependencies_parsed_at":"2023-01-30T06:16:42.268Z","dependency_job_id":"ae7f0f24-cc95-44a6-8517-8146c0999b75","html_url":"https://github.com/mmitch/syndig","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/mmitch/syndig","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mmitch%2Fsyndig","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mmitch%2Fsyndig/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mmitch%2Fsyndig/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mmitch%2Fsyndig/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/mmitch","download_url":"https://codeload.github.com/mmitch/syndig/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mmitch%2Fsyndig/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":273713251,"owners_count":25154606,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","status":"online","status_checked_at":"2025-09-05T02:00:09.113Z","response_time":402,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["alsa","midi","pulseaudio","software-synthesizer","synthesizer"],"created_at":"2024-12-31T19:36:58.616Z","updated_at":"2025-09-05T04:31:20.368Z","avatar_url":"https://github.com/mmitch.png","language":"C","funding_links":[],"categories":[],"sub_categories":[],"readme":"a simple software synthesizer in C\n==================================\n\n[![Code coverage status](https://codecov.io/github/mmitch/syndig/coverage.svg?branch=master)](https://codecov.io/github/mmitch/syndig?branch=master)\n[![Linux Build status](https://github.com/mmitch/syndig/workflows/Linux%20Build/badge.svg?branch=master)](https://github.com/mmitch/syndig/actions?query=workflow%3A%22Linux+Build%22)\n[![CodeQL status](https://github.com/mmitch/syndig/workflows/CodeQL/badge.svg?branch=master)](https://github.com/mmitch/syndig/actions?query=workflow%3ACodeQL)\n\nI started to make some music using (analog) synths, but I only have\nmonophonic synthesizers and a drum machine.  I still need something\nsimple and polyphonic for strings and chords.\n\nI already wrote a simple interactive sequencer in Perl, so why not try\nto roll my own soft-synth?  It's a lot more fun to tinker than to\nchoose an existing soft-synth and read a manual ;-)\n\n\nproject home: https://github.com/mmitch/syndig\n\n\nMIDI implementation\n-------------------\n\n### Oscillator types\n\nOscillator types can be selected via Program Change messages:\n\n- 000: square\n- 001: sawtooth down\n- 002: sawtooth up\n- 003: triangle\n- 004: sine\n- 005: noise\n- 006: impulse\n- 007: square wavelet 25% duty\n- 008: square wavelet 50% duty\n- 009: sawtooth down wavelet\n- 010: sawtooth up wavelet\n- 011: triangle wavelet\n- 012: sine wavelet\n- 013: noise wavelet\n- 014: double pulse wavelet\n\nWavelets are small PCM samples with a length of 8 samples.  \nUnmapped programs wrap to 000.\n\n\n### ADSR envelope\n\nTo control the ADSR envelope, send Control Change events with the\ngiven parameter numbers to change these values:\n\n- 072: release time\n- 073: attack time\n- 075: sustain level\n- 076: decay time\n\nThe times map non-linearly from value 000 (0 seconds/off) to value 127\n(about 5 seconds).  \nThe sustain level maps linearly from value 000 (envelope off) to value\n127 (maximum envelope).\n\n\n### Polyphony mode\n\nPolyphony mode can be selected via Control Change event for\nparameter 003.  The polyphony mode chooses the note to kill\nprematurely to make room for a new note when polyphony is at maximum\ncapacity:\n\n- 000: kill oldest note\n- 001: kill lowest note\n- 002: kill highest note\n- 003: kill in a round robin fashion\n\n\n### Other commands\n\nThese Control Change parameters are also honored:\n\n- 007: channel volume\n- 120: all sound off\n- 123: all notes off\n\n\ncopyright\n---------\n\nsyndig  -  a simple software synthesizer in C  \nCopyright (C) 2020  Christian Garbs \u003cmitch@cgarbs.de\u003e  \nLicensed under GNU GPL v3 (or later)  \n\nThis program is free software: you can redistribute it and/or modify\nit under the terms of the GNU General Public License as published by\nthe Free Software Foundation, either version 2 of the License, or\n(at your option) any later version.\n\nThis program is distributed in the hope that it will be useful,\nbut WITHOUT ANY WARRANTY; without even the implied warranty of\nMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\nGNU General Public License for more details.\n\nYou should have received a copy of the GNU General Public License\nalong with this program.  If not, see \u003chttp://www.gnu.org/licenses/\u003e.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmmitch%2Fsyndig","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fmmitch%2Fsyndig","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmmitch%2Fsyndig/lists"}