@Digicomposer You use minor key samples. Or do you want to convert major key samples into minor key?
Since you need to change the intervals between the notes to convert audio between major and minor it will need some expensive plugins or tools, like Zplane reTune or Melodyne Studio.
Firs you need to set root notes for your audio clips. You can only set these on beatmapped, or looped audio clips.
Right click an audio event on your timeline, select clip properties
ensure the Acid Type is set to looped, or beatmapped
click the Stretch tab
Set a root note for the clip
Now, set a root note for your project - this is done next to where you set the project tempo, or search the online help for "Changing Tempo, Time Signature, and Key".
As acid can't break apart the audio in to harmonic frequencies it can't re-align audio to scales like midi, so changing the project key at the property level, or by inserting a key change on to the timeline it will simply pitch your audio clips up or down to match.