Is it possible to use two sets of outputs - as in run the XLR outputs to the house PA and run the line outs to a keyboard amp so band can monitor?

Yes, the input signal, regardless of connector used, is present on all outputs. http://artproaudio.com/downloads/specsheets/ss_dti.pdf

does it have a ground "lift" option, switchable?

No "BUT" all outputs are ground isolated from the chassis so a "lift" switch is not necessary when using this.

I want to use my studio monitors with my Macbook Pro. What cable do I need to use to plug this into my laptop?

Hi Jason,I would use an 1/8" to XLR Male Y cable like this:http://www.amazon.com/Hosa-CYX-403M-Stereo-Breakout-Cable/dp/B000068OEP/ref=sr_1_9?m=A3QYKZ7LXW9O3&s=merchant-items&ie=UTF8&qid=1448889739&sr=1-9&keywords=hosa+1%2F8+to+xlrIf this was helpful, please consider purchasing from us. We have them both in stock and ready to ship. - Pixel Pro Audio

My single coil pups are picking up interference (nearby laptop, etc) and causing my amp to hum and click; higher gain makes it worse. will this work?

You need a ground loop isolator. Some are as cheap as $20

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Description

🔊 Silence the noise, amplify your craft.

POWER WITHOUT POWER - 100% passive design—no batteries or external power needed
TRUE AUDIO FIDELITY - Flat and wide frequency response preserves your sound’s natural tone
PRO GRADE DURABILITY - Rugged build perfect for studio, live, and touring setups
SEAMLESS INTEGRATION - Maintains isolated balanced output to prevent interference and signal degradation
SILENT SIGNAL MASTERY - Eliminates hum and ground loop noise for pristine audio clarity

The ART DTI Dual Transformer Isolator Hum Eliminator is a passive, high-performance audio transformer designed to eradicate hum and ground loop noise without compromising sound quality. With a flat, wide frequency response and the ability to handle high signal levels, it ensures clean, neutral audio output. Its rugged, power-free design makes it an essential upgrade for professional studios, live performances, and home recording setups.

Specifications

UPC	840402016380
Global Trade Identification Number	00840402016380
Manufacturer	Tascam
Part number	DTI
Item Weight	340 g
Product Dimensions	27.94 x 7.62 x 17.78 cm; 340 g
Item model number	DTI
Color	Black
Style	Eliminator
Voltage	240 Volts
Item Package Quantity	1
Special Features	The ART DTI is a high-quality, totally passive solution box intended to eliminate noise (or "hum") in sound systems that is caused by ground loop effects. The DTIâ¢ offers a variety of connection types, has a high performance audio transformer, will not degrade the audio signal, and does not require power. The ARTcessories DTIâ¢ is a high quality, rugged and affordable enhancement to any professional studio, home recording, and touring or installed live performance sound system.
Batteries Included?	No
Batteries Required?	No

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