The touch sensitivity on the middle c is less than the other keys it still works I just have to be gentle on that key, using the controller through Logic pro X and garage band why is this happening?

Dirty key contacts. They are conductive rubber pills that are pressed against circuit board traces. Clean ONLY with 99% isoprophyl alcohol and Q tips gently. Here is a service manual link:

http://elektrotanya.com/yamaha_psr-1000_psr-2000.pdf/download.html

Scroll down to "get manual" and click on it to download. Ignore other downlooad links.

You MAY be confusing touch sensitivity with VELOCITY sensing. Touch sensitivity is PRESSURE put on AFTER the note sounds that causes modulation. VELOCITY is what is used for example to control the loudness of pianoo notes depending how fast they are struck. VELOCITY sensing is done by using TWO contacts at every key... one closes first. IF one of these gets dirty, FULL velocity will be sensed and it will be LOUD. The contacts can be cleaned using ONLY 99% isoprophyl alcohol and Qtips after MUCH disassembly of the keyboard. The contacts are conductive rubber pills in silicone rubber domes. Clean boththe contacts and the circuit traces they pres down onto.

Key contacts are dirty. You will have to service the unit. The contacts (two per key) are conductive rubber "pills" that press down on circuit traces under the keys. Use ONLY 99% isoprophyl alcohol and Q Tips to clean both the black pills in the silicone domes and the circuit traces themselves. Be gentle when doing this. When opening the unit, be careful of all the cables as they are easily damaged.

my keyboard is way too sensiticve. when ltyping if i don't hit my key dead center and just a small lportion of my finger touches a key arouind it, that key is also typed. I am a good typist, but when not looking at keyboard and going too fast I don't always hit jmy key dead cwenter. i would like a keyboard like an old typewriter. do they sell less sensitive keyboards ???

When I have seen this happen, the touch pad was set overly sensitive. When you are typing, your palm may be moving the cursor. If this happens at other times, then this can be corrected in the control panel. Go there and click on touch pad. It will have settings to set the sensitivity for the mouse pad, speed, double click/single, etc. You can change the settings to be more suited to your hands.

FYI: Older laptops were more susceptible to touchpad errors and I have even seen the area on either side of the touchpad to cause the mouse cursor to move and jump.

Good Luck

From Dell:
Customizing the Touch PadYou can use the Mouse Properties window to disable the touch pad or adjust the touch pad settings.

1. Click Start , and then click Control Panel.
   
   
2. Click Hardware and Sound.
   
   
3. Click Keyboard.
   
   
4. In the Mouse Properties window:
   
   
   • Click the Device Select tab to disable the touch pad.
     
     
   • Click the Touch Pad tab to adjust touch pad settings.
     
     
5. Click OK to save the settings and close the window.

Hi. I don't have a 700, but on the other privia's I have seen, there is a function key combo to turn on and off the touch response. Go to casio, and download the manual. You hit "fn" and then one of the lower keys. There are 4 levels of sensitivity on my machine. -Don

If you go to start > (settings) > control panel.

Switch to classic display if applicable.

Select the keyboard icon and you can adjust the sensitivity. This will only work for all the keys but might help you.

Function F7 to disable the touch pad and the same buttons to enable it. The function key is the button with Fn. on it.

Good luck and don't forget to rate my answer.

I don't know if you mean that your cursor suddenly moves as you are typing? If so, it is likely your touch pad is too sensitive. I have a mouse w/mouse pad but never disabled the touch pad. So i disabled the touch pad and it solved it for me. If you want to be sure it is the touch pad being over sensitive, then type a paragraph but keep your fingers and palms far away from the touch pad. If the problem improves, like it did for me, then the touchpad is too sensitive. You can go into the settings for the touchpad to change the sensitivity setting to make it less senstive and see if that works and it does not then press Fn +F7 keys to disable the touchpad.