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I'm looking for an audio player that runs on Windows 10 and supports the following features:

  • audio library (ability to remember a list of songs and sort them by artist, etc.)
  • ability to play MP3 (and ideally MP4 and M4A) files
  • not cloud-based, and software can run entirely offline
  • not subscription-based; one-time purchase only
  • ability to play back any audio clip at a sample rate (or frequency, if you prefer) different than the recorded sample rate

For this last point, I emphasize that I am not looking for the following:

  • pitch adjustment (ability to modify pitch while keeping playback rate constant)
  • playback rate adjustment (ability to modify playback rate while keeping pitch constant)

I am looking for true variable frequency playback whereby the software can pull in an MP3 recorded at 44.1 kHz, I can fiddle with a slider, knob, etc. and set playback to e.g. 40.65 kHz, click "Play", and the audio will play back at 40.65 kHz, with a corresponding decrease in pitch and increase in playback time.

The only audio player I've ever found with this capability was a program called "SuperSonic", which I still use in spite of its last release being in the year 2000. On Windows 10, it's really showing its age and I'd love a replacement, but any replacement must have the above functionality.

I'll code the thing myself if I have to, but if something already out there exists that meets these specs, it would make my year. Cost is no object.

My sincere thanks to anyone who can help.

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2 Answers 2

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Not quite as fine control of the Audio speed as you are asking for but VLC Video and Audio player does offer a playback speed control and I am sure that it would be much simpler to code an extension for it, if one doesn't already exist, than to develop from scratch.

For your requirements:

  • Windows 10 Yes & 7 (95-ME in older editions or with extra download, even XP), Windows Phone, OSX, iOS, most Linux distros, Android, Solaris, QNX, ....
  • audio library (ability to remember a list of songs and sort them by artist, etc.) Uses (and can access many existing formats of) playlists
  • ability to play MP3 (and ideally MP4 and M4A) files Yes and MPEG Layer 1/2, MP3 - MPEG Layer 3, AAC - MPEG-4 part3, Vorbis, AC3 - A/52, E-AC-3, MLP / TrueHD>3, DTS, WMA 1/2, WMA 3, FLAC, ALAC, Speex, Musepack / MPC, ATRAC 3, Wavpack, Mod, TrueAudio, APE, Real Audio, Alaw/µlaw, AMR (3GPP), MIDI, LPCM, ADPCM, QCELP, DV Audio, QDM2/QDMC, MACE plus most video formats.
  • not cloud-based, and software can run entirely offline Yes Installs totally on your local machine but can also play remote file &/or act as a media server
  • not subscription-based; one-time purchase only No Subscription & No Purchase Price
  • ability to play back any audio clip at a sample rate (or frequency, if you prefer) different than the recorded sample rate Current control is by speed factor but could be extended.
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  • I'll check it out. Many thanks for the suggestion.
    – COTO
    Commented Dec 24, 2017 at 15:48
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There is AudioMass, a free and Open-Source player, that's working completely in the browser (also offline as PWA).

  • The playback speed option is percent-based (with a resolution to 5 percent, with a slider control), but it actually increases pitch and speed at the same time and vice-versa (like in the old days).

Changing speed with AudioMass dialog

  • It does not have a fully fledged library, but can store a set of "drafts" locally.

  • It's working completely offline, installable as a Progressive Web App.

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