aconnect(1) aconnect(1)

NAME aconnect - ALSA sequencer connection manager

SYNOPSIS aconnect [-d] [-options] sender receiver aconnect -i|-o [-options] aconnect -x

DESCRIPTION aconnect is a utility to connect and disconnect two existing ports on ALSA sequencer system. The ports with the arbitrary subscription per- mission, such as created by aseqview(1), can be connected to any (MIDI) device ports using aconnect. For example, to connect from port 64:0 to 65:0, run as follows:

% aconnect 64:0 65:0

The connection is one-way, and the whole data to the sender port (64:0) is redirected to the receiver port (65:0). When another port (e.g. 65:1) is attached to the same sender port, the data is sent to both receiver ports. For disconnection, use -d option.

% aconnect -d 64:0 65:0

The address can be given using the clients name.

% aconnect External:0 Emu8000:1

Then the port 0 of the client matching with the string "External" is connected to the port 1 of the client matching with the "Emu8000".

Another function of aconnect is to list the present ports on the given condition. The input ports, which may become sender ports, can be listed with -i option.

% aconnect -i client 0: System [type=kernel] 0 Timer 1 Announce client 64: External MIDI-0 [type=kernel] 0 MIDI 0-0

Similarly, to see the output ports, use -o flag.

You can remove all existing exported connections using -x option. This function is useful for terminating the ALSA drivers, because the mod- ules with sequencer connections cannot be unloaded unless their connec- tions are removed.

OPTIONS CONNECTION MANAGEMENT -d, --disconnect Disconnect the given subscription.

-e, --exclusive Connect ports with exclusive mode. Both sender and receiver ports can be no longer connected by any other ports.

-r, --real queue Convert time-stamps of event packets to the current value of the given real-time queue. This is option is, however, not so useful, since the receiver port must use (not necessarily own) the specified queue.

-t, --tick queue Like -r option, but time-stamps are converted to the current value of the given tick queue.

LIST PORTS -i, --input List existing input (readable) ports. This option is exclusive to -o.

-o, --output List existing output (writable) ports. This option is exclusive to -i.

-l, --list List the current connection status. The connected and connect- ing ports from/to each port are listed together. The suffix flag [ex] means the connection is exclusive. The suffix flag [real:#] and [tick:#] mean the connection includes real-time and tick conversion on the listed queue, respectively.

REMOVE ALL CONNECTIONS -x, --removeall Remove all exported connections.

SEE ALSO aseqnet(1), aseqview(1)

AUTHOR Takashi Iwai <>

August 31, 2000 aconnect(1)