jammr supports several different audio systems on Windows, depending on the sound card your computer has. The older sound systems are compatible with most machines but have noticable lag - they are bad at real-time audio.
This is a quick tutorial on setting up low-latency audio:
1. If possible, choose the “WDM Kernel Streaming” audio system from File | Settings…. This usually produces good results.
2. Otherwise, choose the “WASAPI” audio system and select the recording (input) and playback (output) devices you wish to use.
3. If you are unable to join jams or see an “Failed to start audio” error message, right-click on the speaker icon in the bottom right corner of the screen in the task bar and select “Playback devices”.
4. Choose your device from the list and click “Properties”.
5. Then click “Advanced” and note the audio format (for example, “24 bit, 44100 Hz”).
6. Now repeat this for “Recording devices” instead of “Playback devices” and select formats on the recording and playback devices that match. This will ensure that jammr to use the playback and recording devices together.
We recommend selecting 24 bit and 48000 Hz. If the devices do not support this format, try 16 bit and 44100 Hz. The important thing is to use the same format for both the playback and recording devices.
When you have this set up you should notice that you feel no delay between when your fingers play notes on your instrument and when you hear the notes.