Maiden voyage tonight. When I turned my unit on it DID NOT retain the settings from when I had turned it off after tests at home. Channels were unlinked and I couldn't get it to start a recording for the life of me.
I powered it down, set preset to default, and re-followed Todd's instructions to get the settings back under control.
I also powered down the unit in between sets. When I turned it back on all tracks were disarmed and USB-c was switched from power only to audio. I noticed the green battery meter was low. I had to re-set USB-c to power only and then unplug and re-plug the power cable on the USB-A end to get the MP6 to see the external power again. This may have been an oversight in my part after changing settings to default.
It took a couple of songs before I noticed the tracks were disarmed. The meters bump and the knob LEDs light up whether it is rolling or not. The only indication a track is armed is the tiny track number lit red on the touchscreen unless you press a channel knob and check there. The Wingman app saved my ass as that is where I noticed that they were disarmed.
Have you saved all your settings as a preset? I've done that with my own setup, and then I re-load that preset each time I power up. Always works.
My headphone preset (so as to hear the ISO tracks when the LR MIX is not being recorded) is always retained and never has to be re-selected.
BINGO, that's what I do! Reload the presets and its done in like 2 seconds
Also, KEEP FRESH AA's INSIDE of your MP3/6! See below for reasons why!
I have found that in custom mode with basic gain and everything else advanced, it keeps the tracks armed when I power it on or change to that preset. When I switch to a preset with advanced mode or power on when the last state was in advanced mode, none of the channels are armed and the gain is reset back to 6, no matter where the gain was previously set. I'm not sure about the USB mode, why channels would be unlinked or not able to start a recording.
BINGO again
I LEAVE MY MixPre6 set to CUSTOM MODE, with the Gain on BASIC, and I have had ZERO problems loading it and saving presets and stuff! Also, IMO, there is NO REASON to leave the MP6 in anything but Custom Mode with Gain@BASIC, because that's the only way I know of to have individual gain control for EVERY ISO Track
So I plan on NEVER taking my MP6 off of those settings!
And setup your main few taping scenarios in the presets and thank me later! Also, if you DO NOT have AA's inside of the Mp6, it won't save your settings and you'll have to keep re-setting them! Also, JUST LIKE THE Tascam DR-70D, if you are ONLY supplying USB-C Power and DO NOT have AA's inside, the MP6 WILL NOT SAVE YOUR LAST FILE! So if you happen to run out of battery or the USB-C power gets unplugged accidentally, then plan on LOSING your last recorded file! I thought a HQ company like SD would be able to save the last recorded file, regardless of where the power is coming from!
So IMO, even though the internal AA's are kinda useless for recording times, they ARE useful for saving your settings and presets, AND to make sure that your last recorded file IS SAVED! So even though the 4xAA Tray only gives me around 2 hours of recording, I ALWAYS plan on having some fresh AA's inside of my MP6! Also, if you have AA's inside, you can also HOT-SWAP USB-C Batteries
So there's 3 reasons to keep some fresh AA's inside right there