So I just got my CODE50 two days ago and yesterday was the first day I had to play around on it, and that being at a live rehearsal of all places. I didn't get to do much tweaking, but I noticed a problem with the EQ. If you have all buttons deactivated then the Bass Mid and Treble knobs do absolutely nothing, NOTHING... I tried using the Natural preamp thinking that maybe the EQ knobs are strictly digital and an amp or preamp needed to be activated to enable the EQ to function. When the Natural preamp was selected, however, the overall volume (master knob all the way up and the volume knob at 12 o'clock) was so low hardly anything could be heard. Am I missing a menu option to set the volume or something?
Also, I've saw a lot of people having trouble getting the Marshall Gateway app to connect to their CODE amps, myself being one of these people unfortunately, but I haven't saw anyone come up with a definitive solution other than 1. Updating the Firmware 2. Turn the amp and phone off then restart both of them and try again. 3. Delete the amps Bluetooth profile from your phone and repeat step 2. 4. Call Marshall support. I can get my Samsung Note 5 itself to connect to the amp (getting a weird message on my phone that says verify such and such number is the correct PIN for the Marshall amp but not having any further prompts on my phone or on the amp after tapping OK, but still connecting regardsless), but when I bring up the Marshall Gateway app and go into the menu to connect to the amp I can hit the scan button all day and it will NEVER find my CODE50. What the huh?!!! With all the other people I've saw on this forum having the same problem with the Bluetooth connectivity, you would think there would be a end-all-fix-all solution to such a massive problem. Has anyone heard anything or should I send this amp back for a refund while I still can?
If you are connected via Bluetooth and playing on stage, no one else can connect to your Code unless you unpair from the amp. If you're not connect to your amp the only way someone would be able to do this from the audience is if they come on the stage and press you Bluetooth connection buttons on your amp to activate the Bluetooth on the amp.
I'm sorry to hear that you're having issues with your amplifier. The Marshall CODE is a modelling amplifier which replicates famous Marshall preamps and power amps, therefore having these enabled is essential. If you would like to achieve completely 'flat' clean signal I would suggest looking at our solid-vstate amplifiers such as the MGCFX series. Due to the technological nature of the product Firmware updates will be necessary over time and not updating these can result in functionality issues.
Regarding the Bluetooth, I have never come across the amp asking for a passkey, although older models of phones and tablets did have them for Bluetooth connection, and if you have an older device, then it will not be compatible with the Gateway app.
It would be worth contacting Google play regarding the app not being compatible to download, if you tablet has the right set up and correct versions of Android it should be fine to download.