Nic Stage

It is the same interface, but the MX4-AA (4 AA sled) is intended for use with the MixPre-3 and MixPre-6 only. The MX-8AA and MX-LMount will work on the MixPre-3, -6, and -10T.

The MixPre-3 and MixPre-6 are USB Audio Class compliant and work well with Core Audio.

You would need to drill a hole your battery sled, and with 6V, I would suggest a current rating more like 1.5A. It would rarely draw over 1A at 6V, but under heavy load, it's possible. 1A would be fine at 8V. That (Combined with the fact that you wouldn't have to modify anything) is what makes the MX-LMount combined with a some sort of dummy adapter a better solution, in my opinion.

In advanced mode, the MixPre-3 and -6 will operate like a mixer that most readers here are used to: The input's knob will be the fader and control the post-trim level to the LR mix. The input's trim (Accessible via the Input Settings screen when the input's knob is pressed) will control the level into the ISO track and the into the fader. The selected sample rate has no effect on the available tracks for recording on either product. The MixPre-3 can record 5 tracks of 96k and the MixPre-6 can record 8 tracks of 192k. The USB-C connection is for powering and computer connection only and the USB-A connection is for a keyboard connection only. It isn't possible to use the AC power supply while operating as a USB audio interface on the computer. However, for computers that don't supply enough power on the USB port, there is a special cable included (MX-USBY) with one USB-C connector and two USB-A connectors. The MixPre-3 and -6 will still operate with a straight USB-C to USB-A cable on devices with lower-powered USB ports, but there will be some limitations (Dimmed LCD, Only 2 inputs can have phantom power at a time, USB-A port disabled, and HDMI timecode disabled). On devices with sufficient power on the USB ports, the MixPre-3 and -6 will operate with all features with a straight USB-A to USB-C cable and the MX-USBY wouldn't be required.

That's correct. The available sources for 5 and 6 channels is analog audio from the 1/8" input, USB audio from a computer, or timecode from the 1/8" input. When the Aux In Mode is set to Mic or Line, those sources are available for channels 5 and 6. When Aux In mode is set to timecode, only the USB sources are available for channels 5 and 6.

This feature is not in the current firmware. It's a popular request, though, and I will certainly pass it along.

The allen wrench is included with the unit and has a slot on the rear which it locks into magnetically. There is a captive 1/4"-20 bolt in the middle of the unit. Using the allen wrench, it can be pushed out and rotated for connection to other mounts / gear.

Pressing the fader brings up the Input Settings screen on the LCD. From there, there is a solo option.

The 664 and the 688 differ from the 788T in that they both already have dedicated inputs for a slate mic. The 664 has a dedicated COM output and the 688 uses any of Aux 1-4 outputs for COMs. That is why the CL-12 differs from the CL-9 in that the CL-12 does not provide additional inputs and outputs for COM functions.

The X3, X4, X5, and X6 outputs of the 688 can have any combination of the ISO's or any combination of the X1, X2, L, R, HP-L, and HP-R buses assigned to them. The X1 and X2 outputs have the same source options, minus the X1 and X2 buses themselves (of course). That should make up for the lack of a Link I/O in most setups.

The SL-6 works with the 688 only.

4, 5, and 6 inputs can be routed to L, R, X1 (pre- or post-fader), and X2 (pre- or post-fader):

Like the 664, the 633 comes with a USB A female to USB A female adapter, so a standard USB keyboard can connect to the unit with a standard USB A to USB B cable. Sample rate options: 44.1 kHz, 47.952 kHz, 47.952 kHz “F” (files stamped 48 kHz), 48 kHz, 48.048 kHz, 48.048 kHz “F” (files stamped 48 kHz), 88.2 kHz, 96 kHz, and 192 kHz.

On the show Ghost Adventures, they have a 788T at their headquarters in every episode and I've seen Earthworks mics on there before. But they run around with the cheap handhelds the whole time and I've never seen/heard confirmation that any of their purportedly paranormal recordings were captured with the 788T. I've heard all sorts of creepy sounds from highly compressed (in terms of data) recordings. It's pretty easy for a simple fabric noise to sound like a voice once you crunch all the data.

What make and model SD card are you using? After power cycling, were you able to format it? Is there a CF card inserted as well? Sound Devices 664 & 788T – Approved Removable Storage