Hi JAFFYTRIUMPH !
That's good news that you have the latest Software

There are some limitations of the Trophy Audio system,
which was originally designed to be used with the Garmin Zumo 660.
The 660 model did not Link to the Smartphone App that is now available on the 595 Model.
There are numerous configuration possibilities, and my first recommendation would be
to start again from scratch - delete ALL pairings from all devices, and the Trophy.
The Trophy has two Audio channels that equipment can be connected to :
"HEADSET 1" and "DEVICE 2" ( where the numbers 1 & 2 identify those two Channels,
and does NOT mean there is also a "HEADSET 2", and / or a "DEVICE 1" ).
HEADSET 1 should be used to Pair your Helmet Bluetooth Headset.
( ONLY Headsets with the A2DP Profile can be connected to HEADSET 1 )
DEVICE 2 can be used to connect a Mobile Phone or other Bluetooth device,
including Garmin Sat Nav, or a second Headset device such as a Pillion Headset.
Alternatively to connecting the Sat Nav device to DEVICE 2 by Bluetooth,
it can be "Hard Wired" by connecting the Cradle Power wires
to a dedicated "Clean" Power supply, and connecting the Sat Nav
Audio Output Socket to the 3.5mm Trophy Jack plug.
These are to be found on the wiring harness behind and slightly below the left side mirror pod.
Sometimes they can be accessed by just removing the panels around the mirror,
but usually the complete Fairing needs to be removed.
Here's a Topic on that :
HOW TO: Remove the Fairing ..... etcOnce the Audio Output is connected to that Audio Jack Plug,
Audio from the Sat Nav will over-ride any other Audio being played
by the Trophy Audio system. "NAV" can also be selected as the Source,
if you don't want to listen to any other Audio Source.
If a Mobile Phone is connected by Bluetooth to the Trophy as DEVICE 2,
then any Incoming calls will be displayed on the Instrument Panel,
and can be answered using the Handlebar buttons.
Outgoing Phone calls however can NOT be initiated by the Handlebar buttons,
so to make a call the Mobile Phone needs to be accessed and it's button(s) pressed.
( Pull over and stop to do this ! ! ! )
Mobile Phones such as the iPhone also incorporate an iPod music player,
which can be connected to the USB socket in the Glove box.
"iPod" can then be selected as the Audio source,
with information such as Playlists etc displayed on the Instrument Panel,
and accessible using the Handlebar buttons,
irrespective of whether the iPhone is Paired to the Trophy or not.
So try this :
First Pair your AMP Headset to the Trophy as HEADSET 1,
then Pair your iPhone to the Trophy as DEVICE 2,
Connect your iPhone OR separate USB Music player /Memory stick to the Glove Box USB port,
and Hard wire your Garmin Zumo Audio to the NAV Audio plug.
This should give you most of what you need :
Access the Audio settings Menu to change the Output from SPEAKERS to HEADSETS
and you will be able to select any of the Radio Channels or iPod / USB music source
andhear them in your Headset. Any Audio instructions from the Garmin Sat Nav
will over-ride any music or radio that is being listed to and you will hear the voice instructions,
after which the previous audio will resume.
You also need to make sure that NAV AUDIO is enabled in the ALT SOURCE Audio Setup Menu.
Unfortunately I don't think this arrangement will allow you to use the Smartphone App
linked to the Garmin, or use the Phone App on the Garmin to make and receive phone calls,
or any other features such as Weather reports and Live Traffic updates that require
a Bluetooth connection to the iPhone, as the iPhone is already Paired to the Trophy,
but I haven't actually tested to see whether an iPhone CAN connect to the Trophy
AND the Garmin 595 at the same time - If it does that will be very useful,
as the Garmin Screen could then be used to initiate a Phone Call if necessary.
I have tried the audio from the Garmin 595 sent by Bluetooth directly to my Headset
( N-COM system ) and the quality of the Voice Navigation instructions are very poor.
I have Music files on a Memory Card in the Garmin, which appear to sound much clearer,
but not as clear as when sent from the Trophy Audio system, so there does appear to be
an issue with the audio output quality by Bluetooth from the Garmin !
I hope to be trying some alternative configurations at the weekend,
so will let you know if I find anything else useful !
Meanwhile I trust the above will give you a few things to try -
feel free to shout up with any other questions,
or if I haven't explained anything clearly enough !
Cheers

