Hi.  
 
A question to those of you using iZotope RX4 with Sonar…
 
BACKGROUND:  I have roughly 3 hours of 15 to 20-year-old vocal and acoustic guitar takes recorded on a Yamaha MT-120 4-track cassette recorder that I would like to resurrect/improve inside Sonar. There is a little tape hiss, but it’s not bad.  More troublesome is my having recorded with reverb direct to tape. It's noticeable and too wet in many cases.  I would like to remove (or minimize) the reverb and apply something more subtle and higher-quality in Sonar.  I "settled" on some takes, allowing tape edits and recording noises (pops/clicks).  I can also hear headphone bleed of the reference tracks in the original recording when I solo one of these old tracks in Sonar.
 
QUESTION:  Is RX4 Advanced the answer to cleaning all this up?  Advanced has the dereverb feature and a hefty price tag (albeit, iZotope has it on sale this month for $749 USD). 
 
I suppose I could try to improve my skills with EQs and other tools already I have in Sonar.  I just want to get the best results possible in the least amount of time.
 
Thanks in advance for your feedback/guidance.
 
Marc

The short answer to your question is "yes." 

If it's a one-time thing for 3-4 hours worth of material, it might be worth paying someone who already owns it to do it for you. I imagine that would cost less than $749.

Thanks for your responses, Craig and Don.  Much appreciated!
 
Don, the "hours" reference in my background was a little faulty.  I should have said 3 hours of songs, each with multiple vocal and/or guitar tracks.  I should have used a multiplier.  :)   Having someone else do this audio cleanup for me is still an intriguing idea.  Thanks for suggesting that.

Yes.
We digitize thousands of tapes for customers round the clock with iZotope RX4.
We also use the combination with Waves ZNoise. ZNoise is good for the bright noise on tapes in combination with RX4.

How functional is the RX4 10-day free trial?

SoundSoap 4 is good and very easy to use. $149 or $49 for an upgrade from any older version.

I downloaded the trial of RX4 Advanced and it's fully functional from what I can tell.  You just can't save any of your work.  
 
It seems extremely powerful, allowing for detailed/high-quality surgery on my audio files.  There is a learning (for me), but playing around with the trial version and watching youtube videos on various applications of the tool has been quite helpful.
 
I just need to upgrade my Work Life (standard edition) to the Retirement (full version) in order to free up more time for this most enjoyable hobby.  :)

@THambrecht: Thanks for confirmation and note about Waves Znoise.
@John: thanks for mentioning SoundSoap 4.  I'll have a look.

Another option is Adobe Audition. I believe their trial is fully functional for 30 days, but cannot remember (and possibly changed). I have Audition 4.0 (from CS 5.5) and had CC for the trial, but only used Flash/Dreamweaver for that period (I was allowed to save with both programs, about 2 years ago now).
 
The noise reduction tool is pretty straightforward. You just need a half second or so of background noise to capture as a noise print, then remove it from the track. You need to select a region to capture, and once captured, just click the track to deselect that specific region and remove the noise print from the entire track. I have rarely had to go beyond this (default Adobe settings), but can run it more than once, or even tweak it quite a bit.
 
The de-reverb tool requires a bit more finesse and does not yield perfect results, but can be quite good depending on what you are working with and how deep in the mix that track will end up. The best results are if you can give it a good clue for what it is seeking (i.e. a close proximity of the original reverb settings).
 
As you can set a sonogram view in tandem with the waveform display, it makes editing out pops/clicks a lot simpler and also has an "autoheal" tool that when used on the sonogram view is quite effective. (There is a declick function, but this is not the best choice as it is automated and can easily miss things).