A number of years back, I was trying to make a decision between getting a wireless mic and a monitor, and went with the monitor.  The monitor I ended up with was the TC Helicon VoiceSolo 300XT, and it has served me well (unfortunately, it's no longer made).  The Roland that you have is one I have more often seen used by keyboard players as an aux monitor, and I don't believe it has any way to place it on the floor or on a stand where it is angled up towards you, which is a feature I would look for in any callers monitor.  It's possible you could rig up a stand that would allow you to tip the roland back, or possibly get or make an angled mount that would let you tip it back on a mic stand.  I believe that it is capable of all of the other things I would want to see in a monitor besides that.

Other features that I would be looking for:

I really like having a monitor for the reasons John mentioned: it make it easier to balance your volume with the band, and less likely to abuse your voice because you can't hear yourself.  John is also correct that hearing yourself in the monitor is no guarantee of good sound in the house.  So I also have a wireless mic and if I am not confident in the skill of the person running sound will generally go wander around a bit during an early dance to see what it sounds like.  

Jack 

On Sat, May 12, 2018 at 12:55 PM JD Erskine via Callers <callers@lists.sharedweight.net> wrote:
Hullo Jeremy,

1. Hit up the Contra Sound Forum for advice. Callers are nicely
tolerated, actually welcomed. A great place to ask about such things as
monitors, wireless mics, etc. from sound engineers whether pro or super
experienced amateurs.

https://groups.yahoo.com/neo/groups/contrasf/info

2. Bob Mills book All Mixed Up is a fab resource for understanding many
sound reinforcement tasks. It is, by design, comprehensive enough yet
basic, so may not address every nuance one is interested in. Great place
to start though.

http://bobmills.org/amu/

One might search it (or any other site) using https://duckduckgo.com/ by
entering such as:

monitors site:bobmills.org/amu/

3. My experience regarding monitors is the band does not wish to hear
the caller. Not in _their_ monitor(s) at any rate (why you picked up
your own no doubt.) So, even with a separate one why should they get
blasted by that of the caller?

So consider a position that directs it toward one, away from the bulk of
the band. That may be sideways, up, or both. Elevated monitors generally
work better than on the floor, esp. for the type of sound/information
we're delivering and monitoring.

4. The biggest help I see a monitor for, is to keep the excitable caller
from getting too loud, (you know, when trying to "drag" that one dancer
or couple around the set. <grin>)

It also can help keep one from unintentionally becoming too quiet. Other
than for those purposes I can get by without one, at least for the sake
of simplicity. They are nice.

Pushed on the subject I'd rather have a wireless mic.

I suppose as hearing myself in the monitor is no guarantee of what I
sound like in the house.

Cheers, John
--
J.D. Erskine
Victoria, BC

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Jack Mitchell
Durham, NC