So you went to the manufacturer's driver page <http://www.midiman.com/index.php?do=support.drivers
> and discovered that:
M-Audio uses a 3rd Party Vendor for Unix support. 4Front Technologies
develops and supports UNIX drivers for the Revolution and Delta Series of Products. The software is available for free evaluation and non-profit use but 4Front charges a fee for technical support and commercial use. They can be found at the following web address:
So you went to 4Front, got the driver - note that it is an OSS driver - you installed the driver... and then what?
(It is difficult to come up with suggestions when you give us so little to go on...)