Sonar 7 help....

Hey guys, I have Sonar 7 and a TASCAM 1641 interface.  I have recorded in the past with a mic, but the one I have now is busted.  I am trying to record a little bit on my own going straight through the interface 1/4" guitar input.  How do I select this input?  My only options, that I know of, are under MME devices and they are left, right, and stereo inputs from the TASCAM.  None of those work and I am running out of ideas.  I know how to isolate the 8 mic inputs for larger recording efforts, but I only want to use the number 9 input.  I do have signal going into the interface at this input.  Any help would be appreciated.  Thanks

I switched to ASIO mode, but I only have options for mic 1 (left, right, stereo).  I found an old mic that works, but I am still curious as to why I cannot use all 16 inputs.  The TASCAM is listed as 1 in and 1 out.  I also have a question on playback.  I usually set the output to Master and I can hear my playback through my laptop speakers and headphones, but now that I switched to ASIO; I have nothing.  I haven't recorded anything in about a year, so I am a little lost.  Thanks for the help.

I appreciate the help.  So, basically, if I wanted to record using more than 1 input; I will need to have an updated soundcard that has ASIO drivers?  If I do upgrade, will I then automatically have the options available for more inputs?  For example: I have 1 mic in, out, and stereo now.  If I upgrade card/laptop/drivers, I will then have 1,2,3,4,etc.... automatically or will I have to change more settings?  There is nothing in the TASCAM manual about this stuff and I really do thank you guys for your answers.
 
Also, what sound cards would you guys suggest? 

Alright, I understand that.  What I do not understand is how to use my 16 inputs on my TASCAM.  If I can only use one at a time with my current set-up, what will I need to take advantage of having multiple inputs?