Audacity Forum

The snd-biquad function is implemented in "audacity/lib-src/libnyquist/nyquist/tran/biquadfilt.c", generated from "biquadfilt.alg" in the same directory. I get lost in the C++ code, but my best guess from tracing the problem back from: "highpass2 -> nyq:highpass2 -> nyq:biq...

Try changing the "Audio Host" setting in the Device Toolbar. http://manual.audacityteam.org/man/Device_Toolbar
Audacity does not process the incoming audio, but you may find that one host setting works better than the other.

How about something like this?

lontano wrote:If I click CTRL-l, my whole waveform just disappears.

The short-cut is Ctrl+i (9th letter of the alphabet, as in "me myself") not Ctrl+L.
Ctr+L is the shortcut to "silence audio".

Yes, but with +6 dB gain I was expecting a 6 dB boost below 200 Hz and above 8 kHz, based on the description. The description says "mid-band", so I would expect that "boosting" (positive gain) with that filter will "boost the mid-band". If it boosted everything outside...

It would be possible to add a "slope" parameter though the defaults usually work well for the purpose of "cutting/boosting bass" or "cutting/boosting treble" so I'm not sure that it is worth the extra complication. What do you think? shelf.ny Will there be a README zipp...

I found the "mid band" setting confusing. I was expecting a simultaneous application of low and high shelf but instead I got a band pass/reject between the two frequencies. It is a simultaneous application of low and high shelf, but the filter slope is not very steep, so if the low and hi...

If all of the tracks are mono (and centre panned) the exported file will be mono. To force the exported file to be 2 channels (even if the audio is actually mono), add an empty stereo track (Tracks menu > Add new > Stereo track). I'm not sure why you would want to export a mono recording as a stereo...

There's several ways. Use whichever suits you best: Click at the "ten minute" point then press Ctrl+I to split. Double click on the part of the track to the left of the split to select it, then press DEL to delete. Click at the "ten minute" point then select "Edit menu > Cli...

I've proposed a new patch for bug 152 that doesn't break eq-lowshelf . Does anyone have in depth knowledge of biquad filters? (Edgar-rft?) If anyone has time to test the patch, all you need to do is find the file dspprims.lsp (in the Audacity Nyquist folder) and replace it with the attached version....