The above responses are pretty much what I was going to post as well. There are several variants of "kitchen pipes" - they go by different names depending on the manufacturer/retailer. From what I understand, the terms 'Fairylore pipes', 'parlour pipes', 'kitchen pipes', etc. all describe a set of pipes that are about half the size (diameter-wise, at least) and use plastic reeds in the drones and chanter, making them much quieter than a full-sized set of Great Highland Bagpipes (or GHB).

I prefer my Walsh shuttle pipes (the 'shuttle' is a drone setup with 2-3 reeds in a common body and stock). Similar in volume and tone to the other 'kitchen pipes', and still mouth-blown.

Smallpipes are usually bellows-blown, and can take some time to adjust to, from what I'm told. (My former piping instructor also plays the smallpipes.)

I don't have any first-hand knowledge of electronic pipes. I'm told they're OK for pactice situations when you don't want to make a lot of noise (late nights at home or hotel rooms, etc.), but can be finicky until you get used to the quirks. For those purposes, I believe there is a headphone jack (would that be an 'audio out'?).

I understand that some of the 'Celtic rock' bands that play the Highland Games circuits in the States also make use of the electronic pipes, as they can be tuned to the A=440 standard pitch instead of making the other instruments tune to the pipes "pitch of the day"*. Those sets may use a MIDI interface to add effects as well.

*(For them that don't know, the GHB can indeed be tuned, but the pitch they tune to is usually sharper than the standard, and can vary depending on the temperature, humidity, and barometric pressure of the environment they find themselves in. For example, here in Kentucky the GHB tune to about "A=470"** in the winter, but can go up to "A=481" at the height of summer.)


** Let's please not get into a discussion on what note we're "really" tuning to. It's been done to death elsewhere, and very technical - and frankly above my head as a largely self-taught musician. (I've never had any training in music theory - all of the technical details on what constitutes a chord, a scale, etc. I've just learned how to read the notes in order to play.)