I think this is an excellent idea, and the price point is where it should be. If you want to had soft of hard chromatic autotune to your vocals in a live setting, this will do it great. Unfortunately, I don't think this belongs on a guitar board though, as it is just a little unwieldy, and most powersupplies will not provide the amperage it requires.

So that said, there are things that need addressing because there are a ton of other features. My biggest issues with the product are the extra things, ie the delay, and multi mode input.

The delays are fine totally. Like they do the job, but the controls for setting level, or the tap tempo are less than user friendly, and I am someone who reads manuals. The one in the box had nothing for me. I looked up the one online, and it is not any better. I've since figured it out, but only out of spite.

The multi mode is misleading. Infact, having an instrument line through at all is not great for this. Trying to find the perfect balance of gain for each input is a wildly infuriating task because it is very easy to start clipping one of the two signals as they are dependent gain settings as far as I can tell. The ground lift, and phantom power definitely effect the instrument line. Which means your instrument is going to be much too loud, and clip, well before you can hear your vocals. My suggestion is to use one input at a time, or keep them separate by using the other mode. Probably the vocals.

To end on a high note, the reverbs are actually pretty solid, and easy to dial in either a subtle or washed out sound.

Over all, a very medium pedal.

This pedal adds a variety of helpful features for vocals, including EQ modes, three kinds of reverb, three kinds of delay, and of course, pitch correction. The pitch correction is subtle. You aren't going to get Auto-tuned vocals out of it, but it will help if you slightly flub a note. There are a variety of routing options to allow you to have an instrument pass through to detect the key of your music for the pitch correction. There are also options to route both instrument and vocals either through the 1/4" or XLR output. I found that with the signals merged, the instrument was far louder than the microphone, even with the microphone gain turned all the way up, so if you plan to to use a single output, you may need to attenuate your instrument signal or further boost the microphone signal prior to this pedal. Using separate inputs posted no problem, and the phantom power worked well. This could be useful simply as an easy source of phantom power for those cases where it is not otherwise available. The reverbs and delays sound very nice, but only the reverb can be used on the instrument signal, while both can be used on the vocal. Overall, this is a very useful toolkit for vocals featuring most functions you would need on most all the time with a good selection options.

This small effects package allows the performer / vocalist to add a little "fine tuning" enhancement. It adds variable types of reverb, some tone enhancement, and pitch control. The pitch correction feature is not radical or intrusive, it is for the times when you are not quite "on". It adjusts to the nearest pure tone so if you are actually too sharp if will move up to the next higher note, much too flat it will drop you down to a lower note. A bad note is still a bad note, but if you are close this will make it perfect.

The tracking of the input vocal is amazing. The ability to easily switch harmony option is easy/quick. The pedal fits easily on a mic stand.
I cannot wait to take it out to a gig.
I do see one issue...
The pedal is supposed to support a pass-thru option (clean signal) for the mic via the foot switch. My pedal is not doing so. For live performance, will mean always having a dedicated mic (I'd kinda planned to anyway for backing myself up) and then one other for guest vocalists.
I've not had luck with support (chat is below and will update if I get a response).
~~
Just purchased "FLAMMA FV04 Harmony Vocal Processor". It seems to be 'always on'. The main footswitch will change the 'Sharp' option, but there is no 'pass-thru' of the mic signal as the guide indicates.
5:00 PM
Guide says this: "When the FV04 is on, press the footswitch twice quickly to turn off both harmony and reverb effects, the footswitch LED will turn off."
5:04 PM
Pressing twice does nothing. Press hold enables/disables sharp mode.
There is no 'hidden' mode with 'yellow' led either...
5:06 PM
~~
UPDATED
I found the pass-thru:
With Red/Natural option selected (surprised this is not the default when the unit is powered up - 'Sharp/Blue' is default), a short pause and second click/press will enable the pass-thru.
Posted a noted to the support site:
For product improvement, I would have Natural (vs # / Sharp) be the default option.

I've tried loads of guitar pedals, from Amazon imports to boutique American brands, so when I saw the Flamma FV02 I wasn't sure what to think. Price-wise it sits sort of in between the two extremes, somewhere around 120$. I think you could be fooled by its appearance into categorizing it with the Ammoons, Gokkos, and Amazon Basics of the world, but this Flamma line incorporates a lot of features you would expect from higher end products.

It sports a soft footswitch, both XLR and 1/4 ins and outs with options how to mix the signals, a ground lift switch, a subtle digital reverb and a number of voice doubling functions (I imagine this goes for the entire FV Line, just replace Doubling with Harmonizing or whatever). I also really like their proprietary LED placement and interface. It looks cool and offers some more switching options than your usual ON/OFF switch.

Sound quality is pretty much in line with what you'd expect from a modern digital pedal. The effects themselves aren't radical, but they will definitely fatten up a voice and the minimal controls do let you shape the sound fairly effectively.

The power draw is on the high end requiring a stated 500ma. I'm not sure if that's entirely necessary or just to have high headroom but if you're trying to power it from a daisy chain or other guitar pedal power supply just be sure you have an output that can support that. Fortunately Flamma provides a Wallwart power supply if you don't mind dedicating an outlet to this pedal.

I think the only part that is kind of disappointing is the graphic design of the FV02. I realize this is subjective and has no impact what so ever on the functionality, but it kind of looks like it was assembled in clip art and as I mentioned earlier does a real disservice to a quality product by making it look a bit cheap. All that being said I think you would have a hard time finding a similar feature set anywhere else for under 200$.