MOTM

hi!
hope someone can help.

"The MOTM-850 interfaces Roland, Yamaha and CV-out pedals to other 
MOTM modules. It provides 2 signals: a CV out that can be set with 
RANGE and OFFSET controls to cover -7.5V to +7.5V with 
varying 'sensitivity', and a GATE output."
 
which pedals does this interface exactly work with? could someone 
possibly provide model number for the yamaha and roland pedals? and 
what is a "cv-out pedal"? where can i get these pedals? which ones 
are motm-like-quality?

are these pedals on/off-pedals, or do they provide a continually 
changeable voltage (more like a guitar ahwah pedal?)

what exactly will the output of the 850 be - i was hoping to use this 
thing with a filter to provide some wahwah-like effects. is this 
possible?

thanks!

I use an Ernie Ball guitar pedal with my 850. It's a continuously 
variable pedal. Plug it in to the 850 and I can generate a GATE 
signal and a continuously variable voltage. Details and links to 
sound samples can be found here:

http://www.tellun.com/motm/mods/motm850/motm850.html

I've used this with filters to create a wah wah pedal (see the last 
sound sample at bottom of this page):

http://www.tellun.com/motm/diy/tln428/TLN-428.html

The MOTM-850 is a LOT of fun, highly recommended.

At 2:20 PM +0000 2003/09/24, chef_poireau wrote:

>hi!
>hope someone can help.
>
>"The MOTM-850 interfaces Roland, Yamaha and CV-out pedals to other
>MOTM modules. It provides 2 signals: a CV out that can be set with
>RANGE and OFFSET controls to cover -7.5V to +7.5V with
>varying 'sensitivity', and a GATE output."
>
>which pedals does this interface exactly work with? could someone
>possibly provide model number for the yamaha and roland pedals? and
>what is a "cv-out pedal"? where can i get these pedals? which ones
>are motm-like-quality?
>
>are these pedals on/off-pedals, or do they provide a continually
>changeable voltage (more like a guitar ahwah pedal?)
>
>what exactly will the output of the 850 be - i was hoping to use this
>thing with a filter to provide some wahwah-like effects. is this
>possible?
>
>thanks!
>

Roland EV-5
Yamaha FC-7

Paul S.

----- Original Message ----- 

From: "chef_poireau" <chef_poireau@...>
To: <motm@yahoogroups.com>
Sent: Wednesday, September 24, 2003 9:20 AM
Subject: [motm] 850 pedal interface


> hi!
> hope someone can help.
> 
> "The MOTM-850 interfaces Roland, Yamaha and CV-out pedals to other 
> MOTM modules. It provides 2 signals: a CV out that can be set with 
> RANGE and OFFSET controls to cover -7.5V to +7.5V with 
> varying 'sensitivity', and a GATE output."
>  
> which pedals does this interface exactly work with? could someone 
> possibly provide model number for the yamaha and roland pedals? and 
> what is a "cv-out pedal"? where can i get these pedals? which ones 
> are motm-like-quality?
> 
> are these pedals on/off-pedals, or do they provide a continually 
> changeable voltage (more like a guitar ahwah pedal?)
> 
> what exactly will the output of the 850 be - i was hoping to use this 
> thing with a filter to provide some wahwah-like effects. is this 
> possible?
> 
> thanks! 
> 
> 
> 
>  
> 
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ 
> 
>

A 'CV-Pedal' is any pedal that outputs a voltage that you can then 
use to control a module.  CV = COntrol Voltage.  For example, 
stepping on a pedal connected to the 850 creates a voltage sweep that 
you can connect to the frequency input of a filter for your wah-wah 
effect.  Connect it to a VCA for volume pedal effects, or to your VCA 
for wild pitch bend effects (or not so wild: you can scale the 
voltage out of the 850 for more subtle effects).

Scott is correct: it's a ton of fun!

Mike

--- In motm@yahoogroups.com, "Paul Schreiber" <synth1@a...> wrote:
> Roland EV-5
> Yamaha FC-7
> 
> Paul S.
> 
> ----- Original Message ----- 
> From: "chef_poireau" <chef_poireau@y...>
> To: <motm@yahoogroups.com>
> Sent: Wednesday, September 24, 2003 9:20 AM
> Subject: [motm] 850 pedal interface
> 
> 
> > hi!
> > hope someone can help.
> > 
> > "The MOTM-850 interfaces Roland, Yamaha and CV-out pedals to 
other 
> > MOTM modules. It provides 2 signals: a CV out that can be set 
with 
> > RANGE and OFFSET controls to cover -7.5V to +7.5V with 
> > varying 'sensitivity', and a GATE output."
> >  
> > which pedals does this interface exactly work with? could someone 
> > possibly provide model number for the yamaha and roland pedals? 
and 
> > what is a "cv-out pedal"? where can i get these pedals? which 
ones 
> > are motm-like-quality?
> > 
> > are these pedals on/off-pedals, or do they provide a continually 
> > changeable voltage (more like a guitar ahwah pedal?)
> > 
> > what exactly will the output of the 850 be - i was hoping to use 
this 
> > thing with a filter to provide some wahwah-like effects. is this 
> > possible?
> > 
> > thanks! 
> > 
> > 
> > 
> >  
> > 
> > Your use of Yahoo! Groups is subject to 
http://docs.yahoo.com/info/terms/ 
> > 
> >

thanks :)

download for fc-7 manual:
http://www2.yamaha.co.jp/manual/pdf/emi/english/synth/FC7E.PDF

can't find any precise info on the ev-5, though :(

--- In motm@yahoogroups.com, "Paul Schreiber" <synth1@a...> wrote:

> Roland EV-5
> Yamaha FC-7
> 
> Paul S.

thanks to everybody who took the time to reply!!

apparently it matters what resistance the pedals have??

quote ernie ball's pedal faq:
"An expression pedal controls the amount of voltage that allows 
certain functions, such as, delay, distortion levels, volume, etc. in 
a keyboard or an effects processor to perform to whatever parameters 
the user sets it up to do. Our pedal may work as an expression 
pedal , but the manufacturer usually suggests what type of pot needs 
to be used, 500k, 250k, 25k, etc. in a pedal, keyboard, or an effects 
processor. The pedal might require a more sophisticated design, 
contact the manufacturer to determine what type of pedal is 
necessary." 

the ernie ball pedals are available with different resistance values: 
500kohm, 250kohm, 25kohm; and, according to the ernie ball website:
500 and 250 kohm is "suitable for the audio path of passive 
instruments", and 25kohm "for the audio path of active instruments or 
buffered effect returns".

greetings,
chef!

the yamaha fc-7 is rated at 50 kohm +-30%, if i understand their 
manual correctly.

the roland pedal i have no info about (can't find it on their sites).

so: which resistance value do i need/want?

thanks, mike!

> A 'CV-Pedal' is any pedal that outputs a voltage that you can then 
> use to control a module.  CV = COntrol Voltage.  

yes. now, if the pedal outputs a cv, then isn't it possible to 
directly connect the pedal to an attenuator input of a filter, vca, 
etc... 
or:
what exactly does the 850 do? does it just convert the "voltage out" 
of the pedal to a motm-compatible/useable range?

thnx!

At 5:22 PM +0000 2003/09/26, chef_poireau wrote:
>yes. now, if the pedal outputs a cv, then isn't it possible to
>directly connect the pedal to an attenuator input of a filter, vca,
>etc...

Yes.

>or:
>what exactly does the 850 do? does it just convert the "voltage out"
>of the pedal to a motm-compatible/useable range?\

The 850 will allow you to scale the CV pedal output, invert it, 
offset it, and generate a gate signal from it.

At 5:22 PM +0000 2003/09/26, chef_poireau wrote:
>the ernie ball pedals are available with different resistance values:
>500kohm, 250kohm, 25kohm; and, according to the ernie ball website:
>500 and 250 kohm is "suitable for the audio path of passive
>instruments", and 25kohm "for the audio path of active instruments or
>buffered effect returns".
>
>so: which resistance value do i need/want?
>


Fortunately, the 850 is very forgiving and seems to work with almost 
any pedal you can throw at it. The 850 has a jumper that is used to 
select your pedal's maximum resistance range (5K-15K, 15K-75K, 
75K-150K). I use an Ernie Ball pedal that has two pots in it: one for 
the pedal, the other to "warp" the pedal response. I can adjust my 
pedal's maximum resistance from 0 to 125K with the "warp" control. I 
have the jumper set to "75K-150K". My pedal is one of those that is 
"suitable for the audio path of passive instruments" but it works 
fine with the 850. Using the RANGE and OFFSET controls on the 850 and 
the "warp" control on the pedal, I can get almost any range of 
voltages out of the 850.

If I had to buy a new pedal, I'd go for the 25K model. The output 
voltage will be quite a bit higher if you use the 250K or 500K 
models. You can change some resistors in the 850 to work with those 
models, but why bother if you can just get the 25K model.

p.s. Stooge Larry will probably have a lot to say about this topic 
when he gets back.

thanks, scott, i understand how it works now! :)