[ddots-l] questions about sonar

hello all
I have a questions about sonar
1,how to change the tempo of loop in sonar? for example i load the loop in wav 
format,the tempo is 100 and i want to change the tempo to 140 how to make it?.
2,when i play in my keybord and record the music,but i want add some sounds in 
real time,between my record sounds,but not delete this recording,is this 
possible? which one record mode select?

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