[CAUT] IPod and Tune lab

[Porritt, David]

"Is your partial layout set to the 3rd partials?"

Yes, I use the 3rd partial from E3 down, 2nd from F3 - G#4, and fundamental the rest of the way up.

dp


David M. Porritt, RPT
dporritt at smu.edu<mailto:dporritt at smu.edu>

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Keith Roberts
Sent: Saturday, April 10, 2010 10:16 AM
To: caut at ptg.org
Subject: Re: [CAUT] IPod and Tune lab

Yeah, David, thanks for the tip on the 3-1. The 6-2 12ths in the bass lowers the bass by 5 cents but the deviation curve break is greater.

Is your partial layout set to the 3rd partials?

The deviation curve is the lower graph. The upper is the template. The 3-1 starts the treble coming up faster and so leaves C88 almost 10 cents sharper than the 4-2. I have been using the 2-1 setting to gain some stretch in the treble when the 4-2 hasn't pulled it wide enough. The cheaper, shorter stringing scales seem to want to climb faster in the last octave so the 2-1 has worked for me. Usually the curve is within the range of the manual adjusting buttons. I do check and see if my 12ths are lining up too and adjust accordingly. Getting the template curve to be real close to where you think the piano should be is the secret. I see now that you can adjust to a selected style of tuning. Like you say, David, you aren't just stretching the same style wider or narrower, you alter the shape of the curve.
Keith



On Sat, Apr 10, 2010 at 7:25 AM, Porritt, David <dporritt at mail.smu.edu<mailto:dporritt at mail.smu.edu>> wrote:
Jim:

4:1 treble would mean that the double octave has the upper note matching the 4th partial of the lower note.  No I don't do 2:1 in the treble though I know people who do.  My favorite is to choose 3:1 or perfect 12ths throughout.  That might be another reason I tuned the bass aurally.  The nice thing is it gives you lots of quick visual checks.

I start at F3 and tune up chromatically.  When I get to C5 I have a quick check as I can play F3 and if the blocks stop I have a perfect 12th.  All the way up the scale you can quickly check the accuracy of your work and check out TuneLab by playing a 12th below where you are tuning.

Having set the whole tuning up as 3:1, I can check E3 (starting down to tune the bass) by playing B4.  If the blocks are still, I'm good to go.  Further down in the bass 3:1 is probably too narrow so it's time to shut it down and save the battery!

For me TuneLab on my smart phone is a very versatile tool.  You can change partials on the fly, set your octave style to real world numbers (4:2, 6:3, 3:1 etc.) rather than a numbered stretch that someone else has programmed.  Yes, it probably does have a little more of a learning curve and maybe I am a control freak but I like to have the real control of the tuning parameters.

You'll get there - but it is to some extent a figure-it-out thing.

dave


David M. Porritt, RPT
dporritt at smu.edu<mailto:dporritt at smu.edu>

From: caut-bounces at ptg.org<mailto:caut-bounces at ptg.org> [mailto:caut-bounces at ptg.org<mailto:caut-bounces at ptg.org>] On Behalf Of Jim Busby
Sent: Friday, April 09, 2010 9:19 PM

To: caut at ptg.org<mailto:caut at ptg.org>
Subject: Re: [CAUT] IPod and Tune lab

Dave,

(Showing my ignorance...) I didn't know how to choose so I had to look/see and found that it says 6:3 bass  4:1 treble.  I just thought it would "choose" something automatically. I guess 6:3 is OK for the bass but what do they mean 4:1 in the treble? Do they not do 2:1 in the high treble? I'm not sure how the dang thing works. I've really liked the Verituner for the reason that you turn it on and it figures it out for you. (Well, somewhat. I have learned to tweak it.) I got the IPod to have a backup.

As far as confidence goes... not much! I have simply just turned it off and finished by ear, after re-doing stuff.


Jim

From: caut-bounces at ptg.org<mailto:caut-bounces at ptg.org> [mailto:caut-bounces at ptg.org<mailto:caut-bounces at ptg.org>] On Behalf Of Porritt, David
Sent: Thursday, April 08, 2010 5:15 PM
To: caut at ptg.org<mailto:caut at ptg.org>
Subject: Re: [CAUT] IPod and Tune lab

Jim:

What octave type are you using?  How much confidence do you have in your inharmonicity measurements?

As you and I have discussed before I turn mine off when I get down to the wrapped strings.  From there and south, I just go for smooth octaves and check double & triple octaves.

dave


David M. Porritt, RPT
dporritt at smu.edu<mailto:dporritt at smu.edu>

From: caut-bounces at ptg.org<mailto:caut-bounces at ptg.org> [mailto:caut-bounces at ptg.org<mailto:caut-bounces at ptg.org>] On Behalf Of Jim Busby
Sent: Thursday, April 08, 2010 5:30 PM
To: caut at ptg.org<mailto:caut at ptg.org>
Subject: [CAUT] IPod and Tune lab

All,

I'm still trying to get Tune lab to work on my IPod. (I touch)  Here's the problem; when I take the readings for the Tune Lab on the IPod, then tune while comparing the tuning to both the SAT and Verituner the Tune Lab is 4 or 5 cents different at B2 (or around the break). Verituner and SAT are fairly similar. At A4 (A440) all 3 are dead on. Aurally I can't stand it either, so it's not just that the Tune Lab is different - it's just not right or I'm doing something wrong because friends that use Tune Lab on their PDA's end up with great tunings.

How can I get a good tuning w/o trying to tweak the specs??? Anyone know? I mean, with SAT and Verituner it's hard NOT to get a good basic tuning even w/o messing with it.

Thanks.

Jim Busby

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