That’s a SMR-4, DSP, and SVF board all running off a 9V battery 
Total current draw: ~300 mA.
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good to know! thanks for posting!
how long can that battery last in this situation?
Thats a good question that I’ve been kind of wondering myself. I think I may have to run some real world tests with one next weekend when I can sit around and baby sit it
I remember running my WTPA from a 9v Duracell battery just like that. I got a good 3 hours out of it before it gave up.
Im no electronics whizz, but the Shruthi seems a lot more complex than a WTPA, so… 3 X Shruthi’s?! I’d have thought well under an hour?! At a guess…
Btw, is a that a bamboo panel I spy in that pict? 
In terms of power consumption, the only difference with the WTPA is the LCD backlight. The WTPA has more logic glue, less analog stuff.
The first Shruti lasted 11h on a 9V battery.
@ paul
No, just the black one sided stuff with paper on it. I did get some bamboo done for some GM5s i built based on the 3mm amber stuff they have now at ponoko though:
This is finished with a couple coats of polyurethane: http://midibox.org/forums/uploads/gallery_3870_24_378013.jpg
@ Pinchenettes: wow, and that was with a backlit LCD?
Nice juice box. Last year I found some of those half box/sled looking holders that I used for one of my Shruti (and yeah, 11 hrs. sounds about right I think I got about 3 days of moderate use). Then I couldn’t find them anywhere anymore. Just metal clips and plastic hats. 
Thanks for sharing. 