Overdubbing Tracks not syncing?!

I have my drums mic'd and have been playing with that most of today.  I laid down just a basic beat for a few measures, played it back, and it was ok.
 
I am trying to add a bass track to it and, during recording of that track, I hear the playback of the drums and the bass is right on.  However, when I playback the entire mix, the bass is a split second behind.
 
So i tried recording the bass part again, this time the Input Echo so I can hear it through.  What I got was a delay between playing and what I was hearing.  I'm not sure really where to start here, whether it's a buffering thing or just need a reboot or what.  Any help would be great, thanks!
 

I find that a lot of my guests can hear any delay longer than 5ms.

Here are some questions

1) As stated above... what is you latency set to? If you were monitoring the overdub input channel through real time hardware it shouldn't matter... but when you switched to monitoring the overdub input channel through input echo it does matter.

2) Are you using headphones or speakers to monitor?

3) Are you using WDM and wave profiler to automatically compensate for latency?

4) Are you using ASIO... and if so have you made a ping test and learned of the need to set your manual offset to augment the auto latency compensation so that the compensation is actually accurate?


Considering these questions will be a good start to figuring out the solution.


best regards,
mike

Even if your latency is a little high, SONAR compensates for it when over-dubbing, so new tracks whould still be perfectly aligned with existing tracks you monitored while recording - whether input- or direct-monitoring.
 
It's a little easier to tell exactly what is going on in ASIO mode; first because SONAR tells you how many sample of latency there are everywhere in the chain, and second because you can easily double-check it using the free CEntrance ASIO Latency Tester to ping for the round-trip time.
 
With WDM, you can't disable the compensation, so it's harder to know what it it is, but you can re-record an existing track via anlaog loopback path, and check the alignment of the wave forms by zooming in and counting samples as you nudge them into alignment visually. Generally there will be a discrepancy of a less than 10-20 samples that you can correct for by adding a "Manual Offset " in Audio Preferences, but you wouldn't likely be hearing that small error. If the discrepancy is a lot bigger than that, there's a problem with the way the interface is reporting its latency to SONAR.
 
Finally, I don't know anything about the Tascam 1800-US, specifically, but I know that a lot of people have had trouble getting decent low-latency performance out of older Tascam interface/mixers.

Thanks everyone for the direction, it was the right one, I think I have at least rectified this immediate situation.  Tom, I have Studio not Producer, so I couldn't use the SessionDrummer 3, though I would like to now :)

I changed the Driver Mode from WDM/KS to ASIO under Preferences -> Playback & Recording.  And under the Tascam-1800 option in Windows Control Panel, I set the device to Normal Latency (I think it was defaulted to that) and it seems to work ok.  I cannot use the Input Echo because it gives me the same effect as before, but that may be fixable, however, I don't think I need it.

Thanks again all!

I have an itching feeling that the issue (for me anyways) was a crazy combination of the Tascam US1800, X1a, and Win64.  This stuff is always a work in progress, but the forums can be your best friend!

Good news is, it's fixed!

DeeringAmps,

     I've read these posts and seeing as I'm quite a noobie, I find this confusing but would like to learn.  I have a similar problem(I think) but, I purchased an M-Audio D44 card so I think my latency is much lower than the on-board sound card I was using was. 
     Is there a way to tell how much latency you have?  Let's say...I have an audio clip that I want to add a midi recording track to...is there a way to check to see what your latency is after recording?  It's hard for me to hear any latency when played back but then again, perhaps my ears aren't what they used to be... 

I guess I'm not sure what I need to check.  I thought that perhaps there was a way to check the latency to see if everything was in sync.  Yes, I would like to see how, if at all, my playing is out of sync.  Thank you for the response.
Keith