The actual softsynth plays some filtered frequency
modulated sinus instruments.
Two sinus waves are frequency modulated and then
filtered with a resonant lowpass filter.
You probably only learn how to make sound with
this program by doing...

Some basic documentation follows:

The "t" labeled window:
Loading and saving is done in the menu.
import is obsolete, and export is only for the coder.
The keys "y/z s x d c v g b h n j m," are used for playing
notes as on a piano at octave 4.
"+-" changes the instrument under constuction.
The values may be changed by clicking into the sliders.
Some values are "evil". Prepare to hear _really_ nasty
sounds when clicking around without knowing what you do...

The "pattern Editor"
On the left you see the currently edited pattern
(of fixed size 32). Every note has V(olume)
C(utoff frequency) D(uration until release phase of note)
noted.
Notes may be entered with "y/zsxdcvgbhnjm," keys, the pattern
is changed with "e" and "r". The instrument may be changed
with "+-", the octave with "*/" the volume with
POSUP, POSDOWN, the Duration with POS1,END and the cutoff
freq with INSERT, DELETE.
The right shows the order in witch the patterns are
played. From left to right you see the eight tracks that
can play simultanious. The 99 pattern is used as the silent
pattern. You may enter patterns by pressing two numbers
like 0 4 for pattern four.
The currently edited pattern can be played with "p", the
whole song starting from the marked position at the right
side with "o". Music stops by pressing "i".

Phew, I hope this explains anything...