Software that allows you to draw waveforms for Mac

[EVPS]

Hi,

I'm looking for a bit of software that make it possible to draw my own waveforms on OSX - and then create an audio file that I can load into a sampler.

I have heard that Soundforge on Windows allows this, is there anything out there that does this. Ideally I just want to create single or maybe double cycle waveforms for looping.

Hope someone here can help, i did find this shareware piece called Audio Tool - but it only generates harmonics on a table, I think I'd like to be able to actually draw the wave form.