# SlicerSoundControl Questions

**URL:** <https://discourse.slicer.org/t/slicersoundcontrol-questions/5749>\
**Category:** Development\
**Tags:** extensions-manager\
**Created:** [February 12, 2019, 10:14pm UTC](https://discourse.slicer.org/t/slicersoundcontrol-questions/5749 "2019-02-12T22:14:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lRaulMN7](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lraulmn7/32/3048_2.png) [@lRaulMN7](https://discourse.slicer.org/u/lRaulMN7)\
**Post date:** [February 12, 2019, 10:14pm UTC](https://discourse.slicer.org/t/slicersoundcontrol-questions/5749/1 "2019-02-12T22:14:34Z")

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Hello! I have a few questions ^-^.

In soundnav.py:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/8/a8edac6ed90880e78e0608e679ffa9476b4c660a.png)

n line 261, why do we need to check again that we are working with an instrumentName?

Also, about this method:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/8/180997a0fd32051e0f7b78206d0cecb9df6cf281.png)

In lines 329 to 333, I see you get the Distance using that method. Which library should I check to see all the attributes from the instrumentNode? Because I want to find the same attributes you get in the “vtkMRMLTransformNode” (X,Y and Z from the needle and the target)  
Thanks for reading!