To answer a couple mentions about "enough power" or "the nxx0 having enough for powering _ _ _ _" whatever...
The point of "a" pickup...or pickups is that "noise" is fed no differently than a microphone.
You don't need any more additional input power...
or needed power to run a pickup or pickups...
just microphone in...
for that matter ..I don't see why the necessity of an "input" mic port is even a need....since there isn't really an "mic" input port...but there is a natural device inbuilt mic on the nxx0.
So some silicone putty and slapping your nxx0 either on the inside of the instrument or outside (on the soundbox/chamber of course...where the most vibration can be picked-up would work)..of the instrument...turning the nxx0 into an outrageously capable oyster pickup.
(Personally I use dual stereophonic pickups and oysters in my harps and dulcimers..straight to one of my laptops...and use rakarrack, native, etc....
and then out through the headphone jack to either headphones for personal use ...or straight into one of my multi- effects processors and then from there straight to one of my amps)
.as far as output from the nxx0 goes...output through the headphone jack on the nxx0 to "power" something like an amp...well that is just silly...how many handheld devices do you know of that power amplifiers?
It doesn't "power" anything...for lack of a better term...to keep it simple...the pickup uses a very insignificant amount of juice to "transmit" the sound to an amp/ effects processor/ laptop ...whatever...transmitting yet again from that point to another after altering the sound to amplify it ...that doesn't have to be a huge consumer either...the output from the end point to be audible or stadium blasting is dependent on the power supply "from" the amp itself ...not the device "medium" (nxx0).
If you wished to use the (nxx0) speakers...you'd have to jury-rig a usb mic input...or something like that with a very loooong cable to the instrument...since if you have the device in close proximity or contact with the instrument utilizing the (nxx0) onboard mic. ..and outputting to the (nxx0) onboard speakers...you are gonna get feedback...don't need that...probably end up roasting your nxx0.

So yeah. there are saner options here...

1-Best option...(my fav. concept ) get an effects processor functioning on nxx0 (I would hope even through easy debian we could get ExEf running properly)...get some silicone...put a generous wad on the (nxx0) device..or a proper flexilble clamp to hold the (nxx0) device mic as close as possible to the where sound emits in greatest concentration (sound hole(s) ) in such a way as to still view and utilize the (nxx0) device screen to be able to play/ change your (nxx0) device onboard effects (ie- ExEf) on the fly. Then simply output to your headphones ..
or output from the headphone port 1/8" male to 1/8" male to your mic input on computer...
or utilize a couple of gold-plated 1/4" female to 1/8" male adapters
http://www.ebay.ca/itm/290634585862?...84.m1436.l2649
cheap or expensive ...depends on what quality you want..
and output to your amp

2- Not-as-fun-option ....No need for an (nxx0) onboard effects processor....just use a flexible clamp or silicone putty to position the (nxx0) device mic. doesn't matter if it is easily accessible (ie- inside the soundbox or out of sight since the nxx0 is acting simply as "the" pickup ...nothing more). Then Utilize the (nxx0) device bluetooth (or other methods of transmission) straight to a laptop and utilize whatever from there...more processors tools and from there feed it through the laptops headphone jack to headphones or an amp...