Callmix.wav - a treatment of the Callington School piano duet
There are several processes at work here.
The first is a panning effect. "Pan" refers to the location of the sound in the stereo image i.e. towards the left or right speaker. The effect here is shifting pan, cycling the sound around the stereo image.
Secondly, I have added some chorusing to give the sound more "body". "Chorusing" is in fact a kind of delay with detuning, but in both cases the changes are so tiny as to be almost imperceptible. The more chorusing you apply, the more perceptible the differences become.
Finally, and most obviously, I have added some echo. This digitally repeats material according to a sliding scale of number of repetitions/intensity, with a general "dying away" effect. The timing, frequency and duration of the echo can be specified by the user.
Torpointinspace.wav - a treatment of the Torpoint guitars
"Echo" should not be confused with "reverb" which sets out to emulate an acoustic environment (such as a cathedral or a bathroom). Such an environment may be "echoey", but that does not necessarily mean one will hear actual repetition of material.
This soundfile is an example of some fairly extreme reverb, which does produce an echo-like effect, but I think you can hear the difference between this and the previous example.
Looehi.wav and Looelow.wav - a treatment of the Looe pianos
I've included just a brief excerpt of these, to save download time.
Looehi.wav is the soundfile sent by Looe Community School.
Looelow.wav is the same soundfile (!), but "sampled" (that is to say recorded) and played back on a keyboard. Because I am playing a very low note, the soundfile plays back more slowly and this changes the pitch. It also produces these wonderful bell-like sounds.
It is possible with digital technology to alter the pitch of something without affecting its speed, but in this case I positively want the slowed-down effect.
Saltashtrem.wav - a treatment of relax.wav
Tremolo effects can work, but they can also quickly become tiresome. The procedure is that the soundfile is chopped up into predetermined chunks of sound and silence. It's a bit like an aural equivalent of strobe lighting.
Music.wav - a treatment of Ben Simpson's soundfile
Ben's voice synthesis has been discussed on the message boards. Here I've isolated the word "music" and simply repeated it, or "replicated" in the jargon. You can hear how voice synthesis works, by breaking down all words into "phonemes" - primary cells of vocal sound - then combining them rapidly to create a word, here "mmm-yoo-sss-ih-kkk". The repetition has the effect of reversing this process in an interesting way.