A couple things to bear in mind are:
Different mics have different off axis characteristics/colorations and that the safe thing to do is to use them on axis.
Miking the chanter 20 degrees off axis to the piper’s right will minimize air blasts from the holes and balance the back D with the front holes better while still pointing away from monitors and mains.
The fewer the mics the less confused the sound. Thusly, it may be preferable to use one mic for the whole thing in quiet circumstances; two mics in most situations - one on the chanter and one on the drones with the regs being picked up by both.
Omni mics have a more natural frequency response and fewer colorations but are a problem on stage as opposed to recording. Cardioid mics may be less colored than hyper-cardioid.
Most mics have a significant peak in the low to mid treble from 2-10 Khz. which will make a bright chanter cut through like a serated edged knife to the ear. There are a few notable exceptions. Knocking this down a few db with the sweepable mid set to 8-10 Khz can leave it nice and warm and still airy on the very top. This works well for drones too if you don’t want them too buzzy.
Monitor placement in relation to mic placement is critical. Also minimizing monitor level is critical to sound quality as well as feedback.
Keep the drones out of the monitor because you don’'t need them in there to hear what your playing. Tune by pressing your ear to the the bag.
Here’s what I ususally use (from my website: www.uilleanpipes.com):
For live applications I use three mics from Crown, an LM 301A for talking/vocal/whistle/flute, a modified GLM 200 for the chanter and a GLM 100E for the drones. The LM 301A is a hypercardioid, small diaphragm condenser on its own gooseneck that mounts directly onto a short 26” stand with a small base. It has very clear natural sound, good directionality, and comes with a unique pop filter and built in cable with low cut switch. The GLM 200 is also a hypercardioid, small diaphragm condenser with captured cord and is modified for a flat, smooth response. I clip it onto a cable clip, right on the vocal mic stand at mid chanter level The GLM 100E is an omni version of the 200 with it’s own battery supply that I make myself using premium parts. I clip it onto the middle regulator tuning pin or onto the bass drone slide. Taking care to avoid the direct wind flow of either the bass or baritone drones. I am able to keep the circuit extremely simple by running it on batteries, single-ended, omni, thus allowing for extremely transparent sound at a low price. It is also excellent for fiddles, as an internal guitar mic, or for recording almost anything. Since it is omni directional, care must be taken to keep it out of the monitor mix, as well as away from any monitor speaker. The 200 can be used instead for feed back prone situations. The GLM200 is also excellent for clipping directly onto accordions. This configuration is very light-weight, compact, low profile and excellent sounding at a relatively low cost and fits easily into my pipe case.
For recording, the recommendation is context dependant. The AKG Blue line is very good for the price and very transparent and neutral sounding. A coincident stereo pair of the cardioid version placed about one foot in front and slightly to the player’s right of the chanter picks up a nice natural image of the entire set. I mostly record with a Crown SASP stereo mic custom modified by me, with built in mic pre. All these mics and more, as well as other home and pro audio equipment are available for purchase from me.
Tim