This is an update to my post on 12th April 2019, it reveals the answer to my original question as to whether the BOSS VE-500 effects can be modulated via a MIDI keyboard input besides that of a guitar. As there is little available info to date on this, I'm hoping the following will clarify the position for our keyboard players should they wish to buy a VE-500 themselves.
"I received my BOSS VE-500 today and I've been navigating the on board menus for MIDI keyboard interfacing. Initially the unit which I received needed a System update, from 1.03 to 1.05, which the dealers didn't know about even though 1.03 goes back to 2018 and the VE-500's launch. It makes me wonder sometimes whether employees ever investigate or familiarise themselves with new product lines when they arrive in stock, or just drink coffee looking cool.
I eventually found that said update via "(www).Boss.info/support" website but it needs some selective searching for the same. Likewise the supplied in box 'OWNERS MANUAL' is very, very brief and basic. Again I needed to search for their online pdf version plus another called "Parameter Guide" which gives more detail of the VE-500's in depth menus. This was accessed via the Boss website too. (www).Boss.info/global/support/by_product/ve-500/owners_manuals/". The VE-500's software program for editing / creating 'PATCHES' on PC or Mac is rather neat and similar in fashion to MicroKorg's Patch Editor. It can also be found on the mentioned Boss manuals web page too.
So now the good new. The VE-500 will interface with my 'Yamaha Genos keyboard' via MIDI using my keyboards transmit channel 1. The VE's changeable receiving MIDI channel for tethering can be found within the VE's on case button menus. These buttons and all their parameters can also be likewise selected/ varied when using the "Boss EDITING Software Suite" which is a less daunting challenge to a relative newbie like me.
In consequence to the above I've managed to create some basic Vocoder effects to start with, these are nice for the moment, but do need plenty of additional tweaking.
The Harmoniser's many vocal presets are pleasant too, but I'm no 'on key singer' so that's one for the professional song birds to experiment with.
There are plenty of options in the VE-500 to edit, save, and thereafter write them to memory in an on board 'PRESET USER' section. However, besides my own Vocoder 'creations' I haven't tried using these others presets as yet. I'm pleased with the VE-500 up to now and hopefully, time permitting and with additional help along the way, I'll make it fit my personal musical needs."
Regards to all,
John