Tripecac
For drums, I tried the Abbey Road 60s kits (with Komplete). The early 60s kit doesn't seem to have a heavy enough kick drum. The late 60s kit has a nicer kick.
However, the kit as a whole seems to have too much reverb or something; it sounds too much like a real drum set rather than a drum set on a record or CD. I know that sounds like a strange complaint (similar to people's complaint about 48 fps in the Hobbit movie), but the "realism" of the Abbey Road late 60s kit makes it sound different from traditional reggae.
I tried compression, but it didn't make it sound closer to the record.
So then I tried sending the kit through Guitar Rig (Komplete's amp simulator). I went through dozens of effect templates, mostly at random, but didn't find anything that sounded right.
So I'm a bit at a loss...
Is the Abbey Road 60s kit not a good starting place? I tried Studio Drummer (another Komplete kit), but that didn't sound right either.
Any tips on how to at least get the drums sounding consistent with that 70s Marley sound?
Not specifically but have you tried the playing with the various settings in 60's drummer. I am nowhere near my DAW for a couple of weeks so I can try it out myself and I only have a copy of the 60's Drums (not drummer) manual but they are pretty similar.
Too much reverb seems to indicate the levels of the room and/or overhead mikes are too high. This is on the drum page and can be adjusted for each drum, page 13 of the 60's Drum manual shows this for the snare. You can also tweak the balance between the top and bottom microphones which will change the sound quite a bit. There is also a transient shaper with attack, hold and decay controls, I suggest you play around with these.
On the mixer page you get to control the levels of the room ambiance as well as the levels of each drum. Lowering the level will or course reduce the apparent reverb. Between here and the drum page you should be able to get the sound bone dry, very roomy or anything in between.
There is already a lot of control here, but if you want to take things further you will have to set up sperate outputs for each drum. This is explained on page 16 of the 60's drums manual. Note you will have needed to have inserted Kontakt into Sonar with "all synth outputs" checked first.
Once you have done this you have the ability to use either Kontakt's effects in the Kontakt mixer or VST or Prochannel effects in the Cakewalk mixer on
each individual drum rather than the whole kit. EQ and compression can help make the kick "heavier" Also try Cakewalks percussion strip, there are a lot of presets there you may find one that gets you within tweaking distance of the sound you want.
Finally send all the drum outputs to a bus and add some final light compression or limiting to glue it all together.