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An arpeggiator just plays back the notes that you feed into it. So, if you play/sequence a Cmaj chord (C/E/G) into it, it will only play back C, E, and G, but it obviously cycles through them in a rhythmic pattern (e.g., up, down, up/down, random, etc.). And, most arps allow you to play back those notes over a range of several octaves. Catanya gives you a lot of flexibility to create your own arp patterns. But, the key point is that you cannot tell an arpeggiator to play back notes that aren't fed into it. In other words, you can't play that Cmaj chord into Catanya and have it spit out a pattern containing D, F, A, etc. notes or create a melody containing notes that aren't played into it.
Step sequencers have much flexibility and come in more varieties. They can trigger notes, intervals, performance parameters, etc. When working with notes, step sequencers are often used to create one-note melodies by creating a sequence of notes relative to what you play into it. For example, say I play a C5 into a step sequence assigned to play the following sequence of intervals (i.e., the step sequence is assigned to change oscillator pitch in semitones):
0 3 -2 0 7 0 10
the notes played back from holding down the C5 (note 0) would be:
C5 Eb5 Bb4 C5 G5 C5 Bb5
And, if I tried playing a a Cmin chord into that same sequence, I'm going to get all of those intervals played relative to each note in my Cmin chord (in other words, a complete clusterf*** of notes). That's what I mean when I say that a step sequencer is not an arp and vice-versa. Step sequencers are great for creating "one-note wonders."
Many step sequencers (esp. Thesys) will work on much more than just note intervals. For example, Thesys will let you assign sequences to any MIDI CC value and much more. So, you can sequence filter cutoff, PWM, portamento, effects parameters, etc. and route it to any synth that can receive MIDI CCs.
edit: clarified step sequence intervals
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Last edited by cryophonik on Feb-24-2010 at 22:25
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