I saw that an SCO MTU: 16:0 should work for audio.
What about an SCO MTU: 64: 0 - will that work?

This is a kensington bluetooth USB dongle 2.0

hci0:   Type: USB
        BD Address: 00:03:C9:AF:21:95 ACL MTU: 1017:8 SCO MTU: 64:0
        UP RUNNING PSCAN ISCAN
        RX bytes:378 acl:0 sco:0 events:16 errors:0
        TX bytes:309 acl:0 sco:0 commands:16 errors:0
        Features: 0xff 0xff 0x8d 0xfe 0x9b 0xf9 0x00 0x80
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'BlueZ (0)'
        Class: 0x3e0100
        Service Classes: Networking, Rendering, Capturing
        Device Class: Computer, Uncategorized
        HCI Ver: 2.0 (0x3) HCI Rev: 0x2000 LMP Ver: 2.0 (0x3) LMP 
Subver: 0x4127
        Manufacturer: Broadcom Corporation (15)