--- In logic-users@yahoogroups.com, "John Pitcairn" <johnp@...> wrote: > > --- In logic-users@yahoogroups.com, "Trevor Gilchrist" <trevor@> wrote: > > IAC only has one bus. > > But it's a two-ended bus, not just a source or destination. Logic will > also receive anything sent to it (Logic listens to all ports), so if > the sending instrument is the selected track in the Arrange, you have > a loop. > > Block the IAC port outlet at the environment Physical Input (cable to > dead-end monitor or such). This will prevent messages from the IAC bus > reaching the Arrange. > > Note that if you're using Logic Express, you're screwed - there's no > way to block one port. In this case, MIDIPipe should be used rather > than IAC. > > John Pitcairn > HI John Have you tried that with sending a midi clock to the software connected thru IAC ? Even cabling a monitor on the inputs is making Logic going mad Best Cyril