Welcome to the new BlahBlahCafe!

Having trouble registering? You can contact us at the "Contact us" link at the bottom of the page.

The boards have been moved to a new server. If you have trouble signing in, or other problems on the boards, feel free to contact us.

All boards have been restored for Guests now.

RMI Harmonic Synthesizer schematics


Post Posted Fri Jul 03, 2009 4:32 am
Analog-Umph


User avatar
Posts: 585
Location: Sydney, Australia
Likes given: 3
Likes received  : 4

:? Maybe.

The one to the left of it is the tremulo depth and it's standard design.

Image
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Fri Jul 03, 2009 10:37 am
ZooTooK


Posts: 19

I have found another pic (looks like it's from the same photo session) with a clear veiw of the label. It sais RATE and the switch to the right sais MODE. My guess is that he added a second LFO. Originally the two "channels" of the LFO (tremulant) has separate waveform and modulation depth, but it's still at the same rate. My guess is that the mode is for having the two channels with separate LFO rates or to use the same. It would really add to the flexibility of making patches!

http://www.fotopedia.com/albums/fad5258 ... 8f1d64f319
Post Posted Fri Jul 03, 2009 1:09 pm
Jakob BC
English Moderator, Studio/Stage Expert

 User avatar
Posts: 4344
Location: Aarhus, Denmark

It's interesting indeed. I have never noticed the custom modifications.
Post Posted Fri Jul 03, 2009 5:21 pm
Analog-Umph


User avatar
Posts: 585
Location: Sydney, Australia
Likes given: 3
Likes received  : 4

ZooTooK wrote:I have found another pic (looks like it's from the same photo session) with a clear veiw of the label. It sais RATE and the switch to the right sais MODE. My guess is that he added a second LFO. Originally the two "channels" of the LFO (tremulant) has separate waveform and modulation depth, but it's still at the same rate. My guess is that the mode is for having the two channels with separate LFO rates or to use the same. It would really add to the flexibility of making patches!

http://www.fotopedia.com/albums/fad5258 ... 8f1d64f319
Excellent pics, you can't get any closer than that, except maybe by taking it home after the shooting session. Good detective work ZooTooK. :fine:

Have a look on the blue lighted pic, there's some extra writing around the switch and the extra knob that's not there on any other pic.
For the switch it says INT A, B and the knob is surrounded with values 1-4.
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Mon Jul 06, 2009 11:34 am
ZooTooK


Posts: 19

Oh my... that was a very observant.
It's at least clear that it's a 3 state switch. But my theory that the switch and pot is used for adding a second LFO (tremulant) doesn't get stronger by these lables. Still possible though....making one o the other or each separate LFOs used.
But the 1-4 scale on the pot is making me wonder if it's a selector with descrete steps and not a stateless pot.

Anybody care to make a guess if these mods where made before of after the recording of Oxygene and Equinoxe?
Post Posted Mon Jul 06, 2009 11:47 am
Jakob BC
English Moderator, Studio/Stage Expert

 User avatar
Posts: 4344
Location: Aarhus, Denmark

Luckily there's a closeup capture of the RMI in the Equinoxe 5 video, but no mods as far as I can see.
Post Posted Mon Jul 06, 2009 8:41 pm
radek tymecki


User avatar
Posts: 959

yup

think they were made near oxy 7-13 era

http://centrume.krakow.pl/~riddick/rade ... o713_b.jpg

look at photo, rmi is with extra knobs
Post Posted Tue Jul 07, 2009 2:19 pm
ZooTooK


Posts: 19

Aha... interesting text.... modifications made by Angel Freddy. If my french doesn't fail me he "added something for opening and closing the filter" - sounds like an envelope for the filter.
Now, the filter on the original does have some primitive envelope, so a more flexible envelope would be useful.

However what's more obvious in the pictures are the amp envelopes for each channel that are modified. The original have only AD or AR envelopes. The picutures shows clearly that they have been replaced by ADSR envelopes. I tend to think that the journalist misunderstood what the modifications where about, although I have great respect for the journalists of Keyboard Magazine (french edition). I read it for some years in the early 1990s....

The added knob and switches could be some ways to modulate the filter by the new envelopes.......


OK sorry for this massive speculation.... I guess only J-M Jarre and Angel Freddy can give us some straight answers...
Post Posted Tue Jul 07, 2009 8:27 pm
Analog-Umph


User avatar
Posts: 585
Location: Sydney, Australia
Likes given: 3
Likes received  : 4

ZooTooK wrote:OK sorry for this massive speculation....
If not on this site than where else, right? :wink:

I do think though that the Oxygene 5 bass sequence sounded lame on the Live in your Living Room DVD. Actually all of the sounds where he needed the RMI for sounded below par.

Wondering if this is just the patch settings or if further processing was applied on the '76 album.
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Wed Jul 08, 2009 12:58 am
GeeJee
The GUV'NOR

 User avatar
Posts: 8327
Location: Zwolle, The Netherlands
Likes received  : 2

Analog-Umph wrote:Wondering if this is just the patch settings or if further processing was applied on the '76 album.
External processing on the Oxygene album? You kiddin me? :punch: :punch:
:mrgreen:
Post Posted Wed Jul 08, 2009 8:24 am
Analog-Umph


User avatar
Posts: 585
Location: Sydney, Australia
Likes given: 3
Likes received  : 4

GeeJee wrote:
Analog-Umph wrote:Wondering if this is just the patch settings or if further processing was applied on the '76 album.
External processing on the Oxygene album? You kiddin me? :punch: :punch:
I'm just throwing it out there :mrgreen:
Without faith nothing is possible. With it, nothing is impossible.







    • 2020 Zoolook.nl
    Powered by phpBB forum software