Soundcard and Audio Processing Software
SNDemo.exe Test your ability to detect CW or a tone in noise. Choose tone frequency
S/N ratio, CW message / speed and output filtering
WAVDSP.ZIP
A number of stand-alone utilities for analysing .WAV files, upconverting and combining several into one wide band stereo I/Q file. Utilites also allow .wav files to be generated with various modulation formats, such as BPSK31, FSK, parallel tones and chirps. These have been written over the last few years for my own interest and for particular one-off tasks.
SignalToNoiseMon.zip Signal to noise measurement, signal monitoring and logging
Latest version is updated and with logging now replaces UWBCNMON.
The .ZIP file contains a single executable that should run without any
need for installaion. Details of the software can be found at UWBcnMon.pdf 
SignalMeasure.exe
Signal measurement using the soundcard.
Uses include gain / attenuation measurement, noise figure (using a calibrated noise head), sun and
moon noise, cold sky/ground etc. S/N measurements.
Adjustable interval and averaging times
The latest version has selectable left and right stereo channels, so can be used for setting up IQ SDRs
and cases where the two stereo channels are used for different things - like noise a figure meter
VB6 Source code can be found in SignalLevel.zip
Vector Scope An old Vectorscope programme writen by G3PLX.
Compares soundcard input against a user-specified tone frequency and plots the
result on an X-Y display. See VSCOPE.TXT contained within the archive for full details