aconnect - ALSA sequencer connection manager
[-d] [-options] sender receiver
is a utility to connect and disconnect two existing ports on
ALSA sequencer system. The ports with the arbitrary subscription permission,
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
% aconnect -d 64:0 65:0
The address can be given using the client's 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
% 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
You can remove all existing exported connections using -x
function is useful for terminating the ALSA drivers, because the modules with
sequencer connections cannot be unloaded unless their connections are removed.
- -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
- -t, --tick queue
- Like -r option, but time-stamps are converted to the
current value of the given tick queue.
- -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
connecting 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.
- -x, --removeall
- Remove all exported connections.
Takashi Iwai <firstname.lastname@example.org>