There is a very low pitched sound on bird-ambience2.ogg that sounds like a truck engine or something. Spectrogram for reference since GitHub doesn't allow audio attachments.

Not that noticeable, but definitely there. Do you have an idea how to remove it from the file? Otherwise I will have to remove the entire file.

Not that noticeable, but definitely there. Do you have an idea how to remove it from the file? Otherwise I will have to remove the entire file.

Since the sound seems to be exclusively below 100Hz, you could probably just apply a high-pass filter for ~100Hz in Audacity or another audio editor. Though I'm not an audio expert, so I don't know if additional adjustments would be needed. I would try it myself if GitHub allowed .ogg attachments.

You can send me a link and upload it somewhere else or do a pull request (there you can upload .ogg files).

You can send me a link and upload it somewhere else or do a pull request (there you can upload .ogg files).

I submitted a pull request.

Thanks a lot for your help. Will be released today.