// [input device port] --> [RETURNED PORT] --> app handles messages
public AlsaPortInfo CreateInputConnectedPort(AlsaPortInfo pinfo, string portName = "alsa-sharp input")
{
var portId = input.CreateSimplePort(portName, input_connected_cap, midi_port_type);
var sub = new AlsaPortSubscription();
sub.Destination.Client = (byte)input_client_id;
sub.Destination.Port = (byte)portId;
sub.Sender.Client = (byte)pinfo.Client;
sub.Sender.Port = (byte)pinfo.Port;
input.SubscribePort(sub);
return(input.GetPort(sub.Destination.Client, sub.Destination.Port));
}