Analogue-sequencer

> 1) is there an optional drum-trigger interface yet?  

Not yet, but it's not too far off.

> 2) can you adjust the triggers?  I purchased the DrumDokta 
> and Paul reports that the ideal trigger should be 10ms triggers. 

On the prototype unit in my drum module, the trigger lengths are 1 or 2ms,
hard-coded in the receiver firmware.
Those are the two standard trigger pulse lengths used for the 808 and 909
sounds.
For the production board, I'll probably add support for configuration
messages to change pulse lengths to suit different applications.

Cheers,
Colin

Hi Colin,
And will the triggers be velocity sensitive? I know Simmons brains 
support this, the others probably too. That's what I miss in the Kenton 
KADI and the Engineers@work board...
I guess the velocity to Voltage range should be user settable (for all 
indi trigger outs) as I expect different brands used different 
standards. 5V seems not so high but I don't know for sure.

Hope it helps,
Eric


Op 11-5-2012 0:08, Colin f schreef:

>
>
> > 1) is there an optional drum-trigger interface yet?
>
> Not yet, but it's not too far off.
>
> > 2) can you adjust the triggers? I purchased the DrumDokta
> > and Paul reports that the ideal trigger should be 10ms triggers.
>
> On the prototype unit in my drum module, the trigger lengths are 1 or 2ms,
> hard-coded in the receiver firmware.
> Those are the two standard trigger pulse lengths used for the 808 and 909
> sounds.
> For the production board, I'll probably add support for configuration
> messages to change pulse lengths to suit different applications.
>
> Cheers,
> Colin
>
>

> And will the triggers be velocity sensitive?

Each 'trigger' is an accent CV and gate pair.
Each MIDI note maps to a pair, with velocity driving the accent CV and
note-on triggering the gate pulse.
I use a mix of 808 and 909 sounds. The 808 uses CVs in the range of 5 to 14
V or so, and the 909 uses 0 to 5 V.
I have the gain set to give maximum range for the CVs (as close to the
supply voltage as the op-amps will go), and scale the velocity values down
for the 5 V outputs.
The DAC is 12 bit, so can be scaled down without losing any resolution.
The accent and trigger outputs can be combined into a single, variable
voltage pulse using the two-transistor circuit you'll see all over the
schematics for the 808 and 606.

Cheers,
Colin

Hi Colin,
Ah, ok. I think I misinterpreted the drum-trigger interface as something 
different then the CVIO breakout box. Now I understand this is the same 
box. So for using "single, variable voltage pulses" one needs to do some 
soldering to make some kind of converter/merger..
Isn't it possible to map the velocity to the trig/gate outputs? What 
voltage does it give? But maybe there's no DAC for the trig/gate out??
Kind regards,
Eric


Op 11-5-2012 10:06, Colin f schreef:

>
>
> > And will the triggers be velocity sensitive?
>
> Each 'trigger' is an accent CV and gate pair.
> Each MIDI note maps to a pair, with velocity driving the accent CV and
> note-on triggering the gate pulse.
> I use a mix of 808 and 909 sounds. The 808 uses CVs in the range of 5 
> to 14
> V or so, and the 909 uses 0 to 5 V.
> I have the gain set to give maximum range for the CVs (as close to the
> supply voltage as the op-amps will go), and scale the velocity values down
> for the 5 V outputs.
> The DAC is 12 bit, so can be scaled down without losing any resolution.
> The accent and trigger outputs can be combined into a single, variable
> voltage pulse using the two-transistor circuit you'll see all over the
> schematics for the 808 and 606.
>
> Cheers,
> Colin
>
>

> Ah, ok. I think I misinterpreted the drum-trigger interface 
> as something different then the CVIO breakout box. Now I 
> understand this is the same box.

No, it is separate.
The CVIO can also be used for drum triggers if you want.
The dedicated drum trigger output uses the DIN SYNC socket.
DIN sync normally has three digital pins, a ground pin and one spare pin.
I used the spare pin for a CV output.
In drum-mux mode, the three DIN sync pins are much like a one-way SPI
interface, with the gate triggers as the data bits and the accent CVs
multiplexed in sync with the SPI clock.
The drum-trigger board is a de-multiplexer for this output.

Cheers,
Colin

Thanks for the reply Colin.

The Dinsync.info manual for the particular DrumDokta DRM-110 eurorack
module, the ideal trigger to achieve standard D110 sounds requires a
10ms trigger.  Having the ability to vary the length would be ideal, in
fact it would be fantastic as it would allow smearing of the output 
sound of some of these drum units.  Plus it would mean I wouldn't have
to add another module to the rack!

cheers
Steve






--- In analogue-sequencer@yahoogroups.com, "Colin f" <colin@...> wrote:
>
>
> > 1) is there an optional drum-trigger interface yet?
>
> Not yet, but it's not too far off.
>
> > 2) can you adjust the triggers?  I purchased the DrumDokta
> > and Paul reports that the ideal trigger should be 10ms triggers.
>
> On the prototype unit in my drum module, the trigger lengths are 1 or
2ms,
> hard-coded in the receiver firmware.
> Those are the two standard trigger pulse lengths used for the 808 and
909
> sounds.
> For the production board, I'll probably add support for configuration
> messages to change pulse lengths to suit different applications.
>
> Cheers,
> Colin
>



[Non-text portions of this message have been removed]

I burnt 2 times an MS 20  by triggering is at a Ring mod drum noise with the TR 808, Inow know why with the 909 was ok and with the 808 smelt to burnt.
THANKS!

> To: analogue-sequencer@yahoogroups.com
> CC: colin@colinfraser.com
> From: lists@ericsmits.nl
> Date: Fri, 11 May 2012 10:39:11 +0200
> Subject: Re: [analogue-sequencer] Trigger output
> 
> Hi Colin,
> Ah, ok. I think I misinterpreted the drum-trigger interface as something 
> different then the CVIO breakout box. Now I understand this is the same 
> box. So for using "single, variable voltage pulses" one needs to do some 
> soldering to make some kind of converter/merger..
> Isn't it possible to map the velocity to the trig/gate outputs? What 
> voltage does it give? But maybe there's no DAC for the trig/gate out??
> Kind regards,
> Eric
> 
> 
> Op 11-5-2012 10:06, Colin f schreef:
> >
> >
> > > And will the triggers be velocity sensitive?
> >
> > Each 'trigger' is an accent CV and gate pair.
> > Each MIDI note maps to a pair, with velocity driving the accent CV and
> > note-on triggering the gate pulse.
> > I use a mix of 808 and 909 sounds. The 808 uses CVs in the range of 5 
> > to 14
> > V or so, and the 909 uses 0 to 5 V.
> > I have the gain set to give maximum range for the CVs (as close to the
> > supply voltage as the op-amps will go), and scale the velocity values down
> > for the 5 V outputs.
> > The DAC is 12 bit, so can be scaled down without losing any resolution.
> > The accent and trigger outputs can be combined into a single, variable
> > voltage pulse using the two-transistor circuit you'll see all over the
> > schematics for the 808 and 606.
> >
> > Cheers,
> > Colin
> >
> > 
> 
> 
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[Non-text portions of this message have been removed]