Main Window

The following screenshot shows the Jamulus main window.


Status LEDs


The Delay status LED indicator shows the current audio delay status. If the light is green, the delay is perfect for a jam session. If the ligth is yellow, a session is still possible but it may be harder to play. If the light is red, the delay is too large for jamming.

The Buffer status LED indicator shows the current audio/streaming status. If the light is green, there are no buffer overruns/underruns and the audio stream is not interrupted. If the light is red, the audio stream is interrupted caused by one of the following problems:

Input level

Input level

The input level indicators show the input level of the two stereo channels of the current selected audio input.

Make sure not to clip the input signal to avoid distortions of the audio signal.

Chat button opens the Chat dialog


Press the Chat button to open the Chat dialog. The chat text entered in that dialog is transmitted to all connected clients. If a new chat message arrives and the Chat dialog is not already open, it will be opened automatically at all clients.

My Profile button opens the Musician Profile dialog


Press the My Profile button to open the Musician Profile dialog. In this dialog you can set your Alias/Name which is displayed below your fader in the server audio mixer board. If an instrument and/or country is set, icons for these selection will also be shown below your fader. The skill setting changes the background of the fader tag and the city entry shows up in the tool tip of the fader tag. This tool tip is shown in the following picture.


Connect/disconnect button

Push this button to connect a server. A dialog where you can select a server will open. If you are connected, pressing this button will end the session.


The server list shows a list of available servers which are registered at the central server. Select a server from the list and press the connect button to connect to this server. Alternatively, double click a server from the list to connect to it. If a server is occupied, a list of the connected musicians is available by expanding the list item. Permanent servers are shown in bold font.

Note that it may take some time to retrieve the server list from the central server. If no valid central server address is specified in the settings, no server list will be available.

Alternatively, you can enter an IP address or URL of the server running the Jamulus server in the server address field. An optional port number can be added after the IP address or URL using a comma as a separator, e.g, A list of the most recent used server IP addresses or URLs is available for selection.

Reverberation effect


A reverberation effect can be applied to one local mono audio channel or to both channels in stereo mode. The mone channel selection and the reverberation level can be modified. If, e.g., the microphone signal is fed into the right audio channel of the sound card and a reverberation effect shall be applied, set the channel selector to right and move the fader upwards until the desired reverberation level is reached.

The reverberation effect requires significant CPU so that it should only be used on fast PCs. If the reverberation level fader is set to minimum (which is the default setting), the reverberation effect is switched off and does not cause any additional CPU usage.

Local audio input fader

Audio fader

With the audio fader, the relative levels of the left and right local audio channels can be changed. For a mono signal it acts like a panning between the two channels. If, e.g., a microphone is connected to the right input channel and an instrument is connected to the left input channel which is much louder than the microphone, move the audio fader in a direction where the label above the fader shows L -x, where x is the current attenuation indicator.

Server audio mixer

Audio mixer

In the audio mixer frame, a fader for each connected client at the server is shown. This includes a fader for the own signal. With the faders, the audio level of each client can be modified individually.

With the Mute checkbox, the current audio channel can be muted. With the Solo checkbox, the current audio channel can be set to solo which means that all other channels except of the current channel are muted.