QMidiArp by Matthias Nagorni, (c)2004 by Novell, 
         published under GNU General Public License
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QMidiArp is an arpeggiator for ALSA. It can have any number of arpeggiator
tabs. Each of these tabs defines an independent arpeggiator. Since all
arpeggiators run on the same sequencer queue, they are automatically in sync
with each other. 
 
An arpeggio is defined in the "Pattern" window. The notes that are actually
played depend on the input notes that are received by the respective
arpeggiator. There is a MIDI filter for this input. Notes that pass this
filter are sorted by pitch and added to the internal note buffer of the
arpeggiator. Notes that do not match any filter can either be
discarded or sent to a selectable MIDI port. Within the pattern, the 
notes are adressed by the index they have in the sorted buffer. 

The syntax for the pattern is as follows:

0..9 : Note indices
   + : One octave up
   - : One octave down
   = : Reset to standard octave
   > : Double tempo
   < : Half tempo
   . : Reset to standard tempo
(  ) : Chord, begin..end, 
       e.g. (012) would be a chord of the 
       first three notes in the buffer   
   / : Volume up by 20%
   \ : Volume down by 20%
   d : Double length
   h : Half length
   p : Pause

Any token is valid until the end of a pattern is reached. The token
> will e.g. double the tempo for all following notes of the pattern.
When the loop jumps back to the beginning of the pattern, the tempo
is reset to its initial value (defined in the "Settings" tab).

The number of notes pressed on the Keyboard will not necessarily coincide
with the maximum index used in the pattern. In case the pattern adresses
note indices beyond the notes available in the buffer, the indices are
calculated modulo the current note count. In the opposite case where there
are more notes than indices in the pattern, the behaviour depends on the
setting of "Repeat pattern through chord". If this is set to "Up" or "Down", 
there will be an offset added to the indices after each traversal of the 
pattern. This way even simple patterns like "01" (or even "0") will 
generate a complete arpeggio.

There are currently only two demo arpeggios. 
I used demo.qma with fluidsynth, the 8 MB GM soundfont of Soundblaster Live
and the following sound settings: 

Ch 0: 12 Marimba
Ch 1:  8 Celesta
Ch 2: 32 Acoustic Bass
 
If you use this with other instruments, you might have to adjust the octave
settings.

QMidiArp was inspired by the MAP1 hardware arpeggiator by Rudi Linhard.
Especially the random features help a lot to let it sound less "mechanical".