[sdiy] Percussion sequencer idea

[Dave Magnuson]

At 06:59 PM 10/2/01 -0400, you wrote:
>Well, I think that sounds like a super great idea.  Is there any reason you 
>wouldn't have 16th notes available?  I mean, if you do a board run or 
>something, I think I would want to get in on one of those (well, after the 
>first of the year anyways) regardless, I think you'd want to have 16th notes 
>available most likely, I guess you could always do some sort of flip flop 
>between two eight step sequences though.


Hi Jon,

Actually 16th note *IS* available.  It will have your choice of clocks at
32nd, 16th, 8th, 1/4 and 1/2 notes for each of the 4 sequencers.  Maybe I
worded it a little weird and it was unclear.

Dave



>         -=<Jonathan Pratt>=-
>       (Phdinfunk at hotmail.com)
>
>
>
>
>>From: Dave Magnuson <resfreq at hoohahrecords.com>
>>To: synth-diy at dropmix.xs4all.nl
>>Subject: [sdiy] Percussion sequencer idea
>>Date: Tue, 02 Oct 2001 15:41:02 -0400
>>
>>Hi List,
>>
>>I'm working on an idea for a percussion sequencer, and I'd like to hear
>>peoples' opinions on my concept before I go through and design/breadboard
>>it.  Here's my plan:
>>
>>I want to use a Blacet MIDI to DIN-Sync IC to provide clock pulses @
>>24ppqn.   I'll run that through a divide by 3 circuit to get 8ppqn or 32nd
>>notes.  I was planning to use (3) J/K flip-flops for divide by 3, or
>>perhaps a decade counter wired to reset on the 3rd step (lower chip count
>>this way).  I realize that using a counter will provide approximately 33%
>>pulse width instead of 50%, but I'm not sure if that will cause problems...
>>so I'd like anyone's advice about this.
>>
>>Next, the output of the divide by 3 will run into a 4516.  This will
>>further divide the signal by 2, 4, 8, 16.  I'll then take the 32nd note
>>clock (from /3) and all of the 4516 outputs and run them to a few rotary
>>switches to select the beat division required. (32nd, 16th, 8th, quarter or
>>half notes)
>>
>>The output of each rotary switch will run to an 8 (4022) or 10 step (4016)
>>gate sequencer.  There will be a total of (4) of these gate sequencers.
>>Each sequencer will have it's own beat division setting allowing one to run
>>at 32nd notes, while others are running at 16th, 8th, etc.  Also, each
>>sequencer will have a pattern length setting and each step of the sequence
>>will have gate on/off switches.  I may also use the carryout function and
>>allow the sequencers to be arranged in combinations of 8 and 16 step
>>sequences (options for 4x8, 2x8&1x16 or 2x16).
>>
>>Finally, the gate outs of each sequncer will run through a shaper to
>>provide adjustable gate length since the 1/2 note gates will be much longer
>>than the 16th or 32nd note gates.
>>
>>I'd also like to tie the start/stop line from the din-sync IC to the reset
>>line on each counter so the sequence will start at the zero state when the
>>MIDI clock starts.  I'll probably also provide individual buffered step
>>outputs from each sequencer on 9 pin D-SUB connectors on the rear of the
>>unit.  This will allow me to connect external CV circuits later as I need
>>them.  All of this will be housed in a 2U rack box with pretty blue LEDs :)
>>
>>I'm picturing this project giving a vast possibility of sequences... I'd
>>love to hear everyone's opinions.
>>
>>Dave Magnuson
>>
>>Resonant Frequency:
>>resfreq at hoohahrecords.com
>>http://www.hoohahrecords.com/resfreq/index.html


Resonant Frequency:
resfreq at hoohahrecords.com
http://www.hoohahrecords.com/resfreq/index.html