I have a thin, reedy, crackling, unpleasant voice and have been struggling to get it anywhere near usable in a mix.
Months ago I downloaded the JSFX Spectrum Matcher and finally, a couple of days ago, decided to install it & experiment.
It's a free VST, is a little CPU hungry but can be "frozen" when the level and quality of correction is as best can be managed/suits the user. This reduces the load massively.
It's best used as 1st in the FX chain as well as on a voice before tuning or other pitch tweaking.
Here're some examples
1st is my voice as it is in the project post a LOT of tuning and processing. It's followed by a correction based on the vocal of a friend and finally in a mix with difference reference vocals used for the main vocal and each harmony part...
Spectrum Matcher sample
Now THIS is where it gets ver BIAB useful.
I usually struggle with the RealDrum stereo tracks - too much kick click or hihat or something. I used Spectrum matcher to tweak the drums on a current project. The BIAB ones were almost rigt but I found I had to do serious EQing and compresing to get closer to what I wanted. I found an isolated rum track for a song I knew was pretty much what I was after so downloaded it, made a profile and used it on the BIAB stereo track. The differences aren't night & day but are MUCH better in the mix:
REAL DRUM matched
The video below explains the what & how and, if followed, it's easy enough. The user saved presets, apart from the one done in that instance, won't appear until a fresh iteration of the plug is loaded.
Here's the writer's intro...

I've some more experimentation to do but can tell this will make my own vocals a bit better. I need to find the best reference vocals to do the job but suspect I'll be using this plug in quite a bit.
Oh, it works for guitar tone etc. etc.

The JS plugins work in Biab using ReaPlugs you just load reajs.dll
The ReaPlugs are installed to
C:\Program Files\VSTplugins64\ReaPlugs\
you can set it to use C:\Program Files\VSTplugins64\ReaPlugs\JS\Effects
or it will use your Reaper effects folder
AppData\Roaming\REAPER\Effects

see reajs_info.txt

That's good but I'd have to ask: Why would I do it in BIAB when I can do it in Reaper?
I know some people see BIAB, more & more, as a decent DAW but I'm not one of them.
It's brilliant at what it does best though.

I would use Reaper for sure but some users are frightened of the unknown and want to stay safely in Biab.

I do use Reaper, it's a great DAW but I can understand that all of that power to fiddle with can be intimidating to some people.

Regarding spectral matching, I use the Meldaproduction MFreeform Equaliser for getting close to another guitar tone, it does a good job. I also use it to easily and quickly create Impulse Response (IR) from the EQ state to be used in my Line 6 Helix and to make my headphone EQ flatter, more suitable for studio environment while mixing in Reaper.

Although this plugin is not free, it is on sale at the moment. I thought I'd make you aware of it. Here is a YouTube video. Watch to the end or skip past the middle section for more relevant content.

https://youtu.be/4zK7AS5muAg

I looked at Reaper but my choice is Studio One.

...Deb

Over the years, I tried cubase and cakewalk and the PC would crash on a regular bases, maybe to do with the interface I was using or maybe due to something else. Then I got to try Reaper and never looked back. The thing I like about it is how stable it is!

Once a month I do the sound for my local big band and use Reaper live for reamping and at the same time to record 18 individual tracks, so far without failing. I have never used studio one, at the end, it doesn't matter what you use as long it is the right one for you and meets your needs.

Ah, there we go. I thought I posted about JS FX Spectrum Matcher but now it's about DAWs of choice.

Fair enough, helping those in need.

That's a very powerful EQ with LOTS of rarely used functions. I can see/imagine how you would use this to approximate the EQ of something else but, for me, that'd require a lot of back n forth between the reference etc. There's also some serious maths behind the function in Spectrum Matcher as it's not just a complex EQ.
If what you're doing works for you then have at it - well done.
My couple of days with this free program/VST/plugin suggest that it's relatively easy, quick and effective so long as the reference source is decent quality BUT YMMV/YRMV etc.

sorry... Point taken.

To the mods. Please delete my posts. Unless there is a way for me to do so. Thanks.

No, YOU were on topic with an alternative - it's related and valuable.

Oh, good, I'm relieved.

I have to try the JS plugin at some point.

UPDATED

Thanks, Ray. This is very useful information.
All the best,
--Noel