thanks a lot for the help jpmorris. unfortunately i don't have 2 machines so do you know how the copy method works? i usually bounce tracks from the tape(i have an otari mx 5050) to my laptop so is there a way that i could get it with that? i'm thinking that would be the best way to add slapback to individual tracks i.e. bounce just the drums to my laptop and record that track back to tape to add the delay. is there another way you can think of for that? what about phasing, is that a multiple machine effect as well? thanks again
For slapback with a laptop and a single machine, you could play the track off the laptop, and record it onto another track through the otari. Assuming the deck has been set up to monitor off the playback head, you'll get a delay around 1/15 sec, so if you get the DAW to play the delayed track at a slightly lower volume or something you'll have a slapback effect.
Phasing with just a single deck and a laptop is going to be tricky, but in theory this should work.
What you'll have to do is take the track which you want to add phasing to, duplicate it in the DAW, and slide the copy forward about 1/15th of a second so that it's delayed by that much. If you're doing this in stereo, you'll also need 4 outputs (you could do it using a normal stereo pair if the track is mono, substitute 'L' for '1 and 2' and 'R' for '3 and 4' in that case).
Make the DAW output the delayed copy of the track to channels 3 and 4 of your digital output, and feed those into a mixing desk. Make the DAW also output the original,
un-delayed copy to channels 1 and 2 of the output, and feed that into the Otari. Ensure that no other tracks are output on either pair of channels or it won't work!
Now, put the otari into record and make it monitor off the playback head. Send the output from the Otari into the mixing desk as well and adjust the levels and the amount of delay time (either the varispeed or by changing the offset of the copy in the DAW) until they start to cancel each other out, and then you should be able to get phasing effects by adjusting the varispeed control on the Otari.
You should also be able to record the output from the mixing desk back into the DAW, though you'll need to slide it back into sync with the rest of the project because it will be 1/15th of a second out or thereabouts.