If i remember correctly from reading the manual, you can audio dub and insert 2 more tracks (most likely a voice over and soundtrack - I'm guessing this is for ENG use) on camera after your shoot. There is also a balance to adjust mix between channels 1/2 and 3/4. When i capture through firewire... there is an option for audio: dv channels 1/2 or dv channels 3/4.

It is on page 85-88 of the manual. The connection is via the XLR or the RCA connectors with the usual routing.

It is a bit involved the first time. You have to use the menu system to set it up.

If you use the XLR inputs, then you can adjust levels.
Balance the channel 1 & 2 sound against the channel 3 & 4 sound in the Menu under Audio Mix.

Several restrictions:

Must be a DVCam tape, not a DV tape.
Video must be present on the tape where the dubbed sound will be placed.
XLR connectors have precidence over the RCA connectors
Cannot have an iLink cable hooked up.

Is it true 4 channel?

I'm not certain what you mean by the word, 'true.' It is represented as 4 separate channels but I have not tested it as 32 bit, dub recording has no interest for me.

Anyone?

I mean when you import it into a NLE does it show up as two or four channels?

Or does the camera mix them and then export them as two?

I have never imported a tape with four channels from a DV tape as of yet that’s why the question…Sorry

On my NLE (canopus), one has to select which pair of channels to import. 1/2 or 3/4. Cannot get all 4 at a time.

I think it shows up as a second stereo audio track but I've not tried it.

Just wondering how is a mic such as the ME66
attached to the 150? Can it be put in the holder
that is used for the mic that comes with the cam?

I switched my 150's to the CAC-12 holder which moves the microphone away from the camera body by another inch or so.

I just wrap my skinny microphones with a bit of gaffer tape or several rubber bands. Seems to work very well.

I suppose rubber sheeting would be more elegant but the temp fixes are easily removed.

I did remove the rubber sheet (the one that looks like very shallow U-channel from the Sony microphone and used it too.