Moog Grandmother tuning question

Any music gear discussions that don't fit into one of the other forums.

Moderators: luketeaford, Joe., lisa, Kent

Post Reply
User avatar
Blairio
Super Deluxe Wiggler
Posts: 1853
Joined: Mon Oct 07, 2013 9:50 pm
Location: Glasgow, Scotland

Moog Grandmother tuning question

Post by Blairio » Wed Sep 04, 2019 11:29 pm

Could I ask a favour of a Moog Grandmother owner / user please?

Could you check whether with the second oscillator's tuning turned full clockwise, the second oscillator is playing a perfect 5th against the first one with no 'beating' at all.

On mine, the second oscillator doesn't quite reach the perfect 5th (it is very slightly flat), so I am getting some 'beating' against the first one, and the 5th isn't really ringing clearly.

It may seem a minor point, but it is taking the polish off a part I'm trying to record at present, and before I go down the pot calibration route, I'd like to know if a perfect 5th is even achievable.

Thanks in advance to someone who can help.

Josef_K
Common Wiggler
Posts: 138
Joined: Fri May 05, 2017 6:57 am
Location: Sweden

Post by Josef_K » Thu Sep 05, 2019 12:17 am

I'll try to remember to check later, but a quick way around it is to boost the OSC 2 pitch with the attenuator/offset module. As long as that (and the OSC2 pitch in) isn't occupied already it should work fine. Of course it's not as elegant, but it's a solution.

User avatar
Blairio
Super Deluxe Wiggler
Posts: 1853
Joined: Mon Oct 07, 2013 9:50 pm
Location: Glasgow, Scotland

Post by Blairio » Thu Sep 05, 2019 1:06 am

Josef_K wrote:I'll try to remember to check later, but a quick way around it is to boost the OSC 2 pitch with the attenuator/offset module. As long as that (and the OSC2 pitch in) isn't occupied already it should work fine. Of course it's not as elegant, but it's a solution.
Good point! Earlier I was considering hooking my GM up to an offset module in my modular rig, but as you say, the onboard one should do nicely.

The more I think of it, the more I reckon I need to run the pot / mod wheel calibration routine. I think I am simply not accessing the available full range of the (digitally controlled) tuning pot.

Thanks,

Blair

User avatar
Blairio
Super Deluxe Wiggler
Posts: 1853
Joined: Mon Oct 07, 2013 9:50 pm
Location: Glasgow, Scotland

Post by Blairio » Fri Sep 06, 2019 8:55 am

Update: I ran the GM calibration routine three times, and on conclusion of the 3rd run, the oscillator 2 tuning control delivers a perfect 5th when turned fully clockwise.

Result.

Xmit
Veteran Wiggler
Posts: 697
Joined: Wed Jul 11, 2012 2:40 pm

Post by Xmit » Fri Sep 06, 2019 9:11 am

I should probably run the tuning calibration on mine then - a perfect 5th for Osc 2 is a fair bit shy of fully clockwise on mine.

User avatar
Blairio
Super Deluxe Wiggler
Posts: 1853
Joined: Mon Oct 07, 2013 9:50 pm
Location: Glasgow, Scotland

Post by Blairio » Fri Sep 06, 2019 9:25 am

Xmit wrote:I should probably run the tuning calibration on mine then - a perfect 5th for Osc 2 is a fair bit shy of fully clockwise on mine.
So it sounds like your oscillator 2 tuning calibration is out in the opposite direction from mine - I couldn't reach the 5th, whereas you seem to be going past it.

As I say, it took 3 goes, but everything is hunky dory now.

Post Reply

Return to “General Gear”