karma~ is a looper/sampler external for Max. It is a dynamic length, varispeed looper with some complex features that are explained in detail in the accompanying help file.
You can download karma~ on my webpage here:
Or from the github repo here:
The linear interpolation used in the recording stage of karma~ is based on ipoke~ by Pierre Alexandre Tremblay:
Video and concept by Angela Guyton and Rodrigo Constanzo.