Crumar Midi rotary interface anyone?

[bbchops]

I'm an old piano player trying to expand my horizons and up my game on the organ. I played a gig up in Canada back in the spring and spent a week behind a B2 with Trek II percussion and what I think was leslie 145. All I'd ever played before were the B3 clones (Roland VK7, Korg CX-3 (both new and old generations). Mind blown.

I picked up a pretty good deal on a Crumar Mojo and I found a Leslie 760 + preamp on Craigslist. Now I'm trying to figure out how to marry them better. (I really don't like the old Leslie preamp and its electro-mechanical stomp switches. The Crumar came with the half-moon switch.) My questions are these:
1. Does anyone have any experience with the Crumar Midi Rotary Interface? It's not terribly expensive, but the documentation is pretty sparse. Crumar referred me to this video: https://www.youtube.com/watch?v=TspxNEIPzpI which didn't offer all that much more help.
2. How do I convert the 9-pin out on the 760 to what I think is the more common/more universal 11-pin?

Thanks,

Jim

[Sweet Pete]

Welcome to the Forum!

Looks like you've been 'gearing up' and that Mojo/760 should sound great together.
There are many ways to accomplish this,easiest being a simple 11/9 conversion cable.
From there you could use the preamp 'as is' to at least test the pair?
The Leslie pin out chart on 'Captain Foldback' website will clue you or your tech in,
to build your own 11/9 cable.
I would also eliminate the 'combo pedal',
The preamp in the Mojo will be superior to the old stompbox.

I would hang a 'Midi Solutions' midi controller off the Mojo.
These have a relay with midi.
Connect the 760 to a Dr. Fishsticks(or build your own like I did) 9 pin motor control.
This would allow you to have fast/slow/stop right from the Mojo panel.

To summarize, you'll need a 9 pin interface,an 11 to 9 pin conversion cable,and a 'Midi Solutions' controller.
John at Midi Solutions will program the midi box to whatever function you'd like! Retains the data!

Happy keyboarding !
cheers,
Pete

[Drawbar Dave]

The 11-9 pin thing didn’t work when I hooked my 11 pinned Hammond XK3 to my 770. The switching is different (Geo explained it to me at the time). It was suggested I buy one of those modern Hammond Suzuki interface boxes but the price scared me off and I changed the 770 for a 330. There is a thread on here about it from earlier this year.

[enor]

The 11-9 pin thing didn’t work when I hooked my 11 pinned Hammond XK3 to my 770. The switching is different (Geo explained it to me at the time). It was suggested I buy one of those modern Hammond Suzuki interface boxes but the price scared me off and I changed the 770 for a 330. There is a thread on here about it from earlier this year.

Any chance you can find that thread? (do you remember what you named it?)

I've been searching for that thread for some time now....

[Drawbar Dave]

Any chance you can find that thread? (do you remember what you named it?)

I've been searching for that thread for some time now....

https://www.organforum.com/forums/sh...-to-Leslie-760

and

https://www.organforum.com/forums/sh...55417-1197-kit

Then I was offered a BC in a B style case for less than the resale value of my XK3 and the rest is history.........

Enor from what I remember, the 1197 and 1147 versions were only available in 117 vac and were forbidden for sale in Europe. Originally I was going to import one and convert it but then the BC came along and changed everything.

[Sweet Pete]

Used the C2D/147 yesterday.That 1/4" 'high output' really drives the Leslie nice.Do other clones like the Legend and Mojo have this feature?
I haven't done the MIDI relay mod to use the C2D stop/slow/fast yet,the Midi Solutions unit will certainly do the trick.
I did hang an 11 pin Leslie off the C2D to verify these controls work....plug and play.

I would make an adapter using just the 11 pin audio and take it from there to any 6W or 9 pin box of my choice(both are unbalanced).
I suppose one could transfer the 11 pin guts to a '760' style box.....but nah,too much work for not enough results.
The 147's and 760's both sound great with the C2D.....this HL822 sounds laughable to say the least......certainly doesn't hasten my desire
to get a 'new' Leslie!

Someone on here modded a SS type Leslie Combo Pedal to accept speaker level signal bypassing the 'preamp' part of the circuit,
making it possible to use 'between' a Hammond and 760/770 type? Maybe just a DPDT switch on those pins?

If the 11 pin protocol for speed switching is as simple as a midi interface to 1/4" switch input I'm in!

[bbchops]

To summarize, you'll need a 9 pin interface,an 11 to 9 pin conversion cable,and a 'Midi Solutions' controller.
John at Midi Solutions will program the midi box to whatever function you'd like! Retains the data!

Thanks, Pete.

If I understand what the Dr. Fishticks controller does, it provides everything the Leslie preamp does *except*
the preamp (i.e., power, leslie control via footswitch). And it appears I can get the the controller in whatever
pin-out I need. And it sounds like your Midi Solutions controller provides a way for me to use either the leslie
control buttons on the Crumar or the optional half-moon switch (which I have) to control the leslie through the
midi out on my Mojo.

If the above is true, then it sounds like the "Crumar Midi Rotary Interface" combines the functionality of the
Dr. Fishticks and the Midi Solutions controller on one board. In the video that Crumar referred me to, the author
put the Crumar interface in a box that I *think* has the following:

• 1/4" jack for audio in from the Mojo
• Midi In/Out for leslie on/off/slow/fast signaling from the Mojo's midi out
• 11 pin leslie socket for cable to a Leslie, which I think was a 3300 in the video
• 12v power

I'm guessing I could substitute a 9-pin socket on the box which would eliminate the need for a conversion cable
to connect my 760.

But I don't know, and that's why I'm here. :->

Regards,

Jim

[Sweet Pete]

Hey Jim,

I've never seen inside a 9 to 11 pin conversion box.Can't imagine it's complicated. Maybe Geo can weigh in on this?
11 pin style has an external AC cable separate from the 11 pin Leslie 'control' cable.No AC in the 11 pin cable.
9 pin actually carries the AC through the Leslie cable.
If there's more to it than that,hope someone will weigh in here?

I built my own 'fishsticks' type boxes as far back as '93.
Never had an 11 pin instrument until recently.
Fortunate the one I have also has a 1/4" 14VRMS output. ;>)
so my 147's are plug and play.
When I did hang this HL822 off it the controls worked etc.
Would need to recase the 11 pin amps into a standard one channel box.
Not a roto'sonic or tolex kind of person....just give me the standard 'furniture'.

Already have a '770' made from a 760/122 box and does it ever work off that 1/4"!
Built a twin 9 pin box for those too.

[enor]

9 pin to 11 pin isn't a problem.
11 pin to 9 pin is much worse, if said 11 pin is on a modern clone organ which has electronics other than just the standard "halfmoon switch" for the speed switching. It requires an external relay box in that case.

[Sweet Pete]

That's what I thought,an external relay....
Could that external relay box be a 'midi controller'?
The midi menu on these clones all seem to have Leslie speed controls?

11 pin from organ into a 'fishsticks' style box to control AC to motors.
The speed switch input on the 'fishsticks' box could be midi controlled!
AFAIK the 1/4" is used on both?
And there will be midi on the instrument and the midi relay!
The 'fishsticks' box won't care where the 'switch' comes from.....

I'm going to try one out from the C2D, off the speed switch inputs of my 'kits'!
Easily programmed right at the manufacturer.
Lots of these in use around the world of MIDI.....for many functions.

[enor]

I'm building this for my Legend live. Takes the 11pin input signal, and kicks it up slightly and makes it balanced via a 122XB input transformer; then feeds it to two places - an 8 pole SPEAKON (wired according to the Swedish de-facto-standard) and a 1/4" jack.

The 11-pin controls two separate sets of mini relays, one set for the SPEAKON and another set for a 3-pin XLR (some of my Leslies are wired with an XLR for the switch).