the default LatencyBuffer value 4 is the minial working value, you won't need to modifiy it.
Rolan ua55 driver have a default loopback mixer, you should turn the volume to minial in the roland control panel to avoid loopback.
RS_ASIO.ini
[Config]
EnableWasapiOutputs=0
EnableWasapiInputs=0
EnableAsio=1
[Asio]
; available buffer size modes:
; driver - respect buffer size setting set in the driver
; host - use a buffer size as close as possible as that requested by the host application
; custom - use the buffer size specified in CustomBufferSize field
BufferSizeMode=driver
CustomBufferSize=
[Asio.Output]
Driver=QUAD CAPTURE
BaseChannel=0
EnableSoftwareEndpointVolumeControl=1
EnableSoftwareMasterVolumeControl=1
SoftwareMasterVolumePercent=100
[Asio.Input.0]
Driver=QUAD CAPTURE
Channel=0
EnableSoftwareEndpointVolumeControl=1
EnableSoftwareMasterVolumeControl=1
SoftwareMasterVolumePercent=100
[Asio.Input.1]
Driver=
Channel=1
EnableSoftwareEndpointVolumeControl=1
EnableSoftwareMasterVolumeControl=1
SoftwareMasterVolumePercent=100
RS_ASIO.ini
[Config]
EnableWasapiOutputs=0
EnableWasapiInputs=0
EnableAsio=1
[Asio]
; available buffer size modes:
; driver - respect buffer size setting set in the driver
; host - use a buffer size as close as possible as that requested by the host application
; custom - use the buffer size specified in CustomBufferSize field
BufferSizeMode=driver
CustomBufferSize=
[Asio.Output]
Driver=QUAD CAPTURE
BaseChannel=0
EnableSoftwareEndpointVolumeControl=1
EnableSoftwareMasterVolumeControl=1
SoftwareMasterVolumePercent=100
[Asio.Input.0]
Driver=
Channel=0
EnableSoftwareEndpointVolumeControl=1
EnableSoftwareMasterVolumeControl=1
SoftwareMasterVolumePercent=100
[Asio.Input.1]
Driver=QUAD CAPTURE
Channel=1
EnableSoftwareEndpointVolumeControl=1
EnableSoftwareMasterVolumeControl=1
SoftwareMasterVolumePercent=100