Audacity Forum

Zoroastroman wrote:The microphone is a Shure 58 and both it and the mixer...

How is the mixer connected to your computer?

Zoroastroman wrote:Done all that mate, but no joy.

Do you see the meters jumping up and down in the Windows Sound Control Panel?

What are your settings in Audacity's Device Toolbar?

A wavetable is a list of the form
(sound pitch-number periodic)
http://www.cs.cmu.edu/~rbd/doc/nyquist/ ... l#index359

(hz-to-step 1) gives the MIDI note number for a frequency of 1 Hz.

"T" means "true" (in this context, the wavetable is periodic)

haivri wrote:where should I be looking?

In the Export dialog options: http://manual.audacityteam.org/man/file ... ml#options

The device should be connected to the computer, and working, before you launch Audacity,otherwise you will need to tell Audacity to rescan for available audio devices. With Audacity entirely closed and the device connected, look in the Windows Sound control panel (http://wiki.audacityteam.org/wiki/M...

Tim Lookingbill wrote:What's not clear using either filter is the shape of the slope of roll off

The shape is very close to an ideal Butterworth filter.
See: https://en.wikipedia.org/wiki/Butterworth_filter
and: http://manual.audacityteam.org/man/high ... ilter.html

What's nice about Audacity's High Pass filter is that it can start at 1Hz but is limited in decibel increments Audacity's high pass filter is not limited to decibel increments. If you want, say 3.1415926536 Hz, then just type it in. However, do note that 1 dB is a pretty small increment. Amplitude ...

I've tried your ExpressionGenerator with tan ... (* x x x (power (tan x) (sin (* x 300)))) Upper trace created by ''ExpressionGenerator'' is displayed with spurious intermittent rectangles, (which do not survive export, the lower trace).png The waveform displayed has intermittent spurious rectangle...

I've never seen this --- "zero at zero" You will probably not see this in Plot Spectrum due to the relatively course frequency resolution at low frequencies. To "see" zero energy at zero Hz, you need to think what "zero Hz" means. "Hz" (the "frequency&qu...

What are you trying to do?
What settings do you have in the device toolbar?