Sonar Platinum track recording question

hello every one , so I got the sonar platinum and I noticed if you record a track with a soft synth and the you go back and record a measure or 2 over the track that you've already recordered  , the audio of the track is muted ,
example track one I recorded a piano sound but I noticed a mistake so all I want is to delete the mistake ( on measure 12) so once the measure 12 is deleted I start recording from lets say measure 10 so that I can listen to the track so    then I know what to play on 12 , but here is the problem , the track does not play once the record button is pressed  just the metronome why??? thank you 

With Midi you would actually be better off to just open the Piano Roll View (PRV) and fix the notes using the smart tool.. You'll really want to learn how to do midi editing  as it make life grand! 
I'm no keyboard wiz so I just hack out my parts with wild abandon and go back and spend a month fixing it up... just kidding, I try and play my part as well as possible and then play trough the song with the PRV on full screen looking and listening for mistakes. I can even embelish my lame 3 finger chords and add more to them, 
 
My routine is to play the part through a few times until I've gotten as good as I'm going to get. Hit record. 
Then I save it.
I open the PRV and determine the note resolution buy changing the grid. Once I see the lowest resolution ,say 16th notes, I quantize to that amount. 
Now I run through the song scrutinizing the notes and adding and subtracting as I go. 
 
As far as auto punching in and out  goes when you set a punch point the old part is muted during the recording. 
In cases where you need guidance it is better to just insert a new midi track and play along with the original. Now you can just cut and paste to add the new part to the original. There is also the Comping feature which I don't use but some people like it. 
In preferences you'll fine "recording" and there are 3 options for re- recording.. Comping, Overwrite and sound on sound. 
 
The deault is Comping so I'll assume your using that. 
When you hit record at measure 10 it will be recording a new lane but I guess you won't hear the original. 
To hear the original up untill 12 you need to use auto punch in/out. 
You can enter punch in and out points using the tool you'll find up in the task bar. You just highlight from 12 to 14 using the timeline and only that will be recorded. 

Cactus, I guess that's an option by recording to a new track and then paste it over but has i mentioned this is a problem that I did not have with home studio 7

If I understand you right, you need to make sure input echo is on for that track and setup auto punch in/out points - in on measure 12 and out on measure 13 for example, and activate auto punch. Then when you hit record from measure 10 and start playing along, Sonar will start playback then automatically record your live input from measure 12 to measure 13 then drop back to playback again.

No....if I set the record button on over a track that is already recorded with a soft synth that same track became mute while is on record mode and all other tracks are playing normally
Example track 2 is recorded with a piano sound for 15 measure Ok? So if for whatever reason I want to add couple extra notes on track 2 on top of the piano sound I,i then would just set the bar back to measure one and then hit the record button for the track 2 ,so I'm expecting for track 2 to play back to me while the metronome is on and record button is on for just track 2 ...but noooo....track 2 is not playing ,is just mute, how the heck wpuld I know where to put my new notes.....

tony2000
I also have some other issues with platinum,should I opens an other tread??
Thank you

Yes. It's better if you just have one issue per thread.

I Will try that thank you Larry J