Dual Sound

Having trouble with LMMS? Ask about it here.
Just started using LMMS and no matter what plug-in sound I select to play via MIDI from my keyboard, or just via my computer keyboard, I always hear the original piano in addition to the plug-in. Any help??
In the MIDI tab of your synth (for example, the TripleOscillator), did you check "ACTIVE MIDI OUTPUT"?
If so, by clicking on the keyboard icon, did you select "Microsoft GS Wavetable Synth"?
If so, this is the reason for the problem.
If not, I just don't know.

To use a MIDI keyboard, check only "ENABLE MIDI INPUT", and select your MIDI device via the keyboard icon.