Big thanks to the following people for sending in their results:
Anders Fahlen, Daniel Gries, Eckhard Doll, Gerrit Davidse, John Brixie, John Reid, Jon Demon, Clemens Ladich, pewe.
Test Results    



Device Manufacturer Latency Jitter Maximum Jitter Remarks API used Driver version Type Ports used OS Processor Number Speed
VSL2020 Steinberg 0.34 ms 0.05 ms 0.61 ms No system exclusive transfer possible with DirectMusic API DirectMusic Unknown PCI VSL2020 Midi
VSL2020 Midi
Windows XP, SP1 Intel(R) Pentium(R) 4 CPU 2.20GHz 1 2205 MHz
SC-8820 Roland 2.96 ms 0.16 ms 0.99 ms - MME Unknown USB 1:Roland SC-8820 MIDI OUT
1:Roland SC-8820 MIDI IN
Windows 2000, SP4 Intel(R) Pentium(R) 4 CPU 2.40GHz 2 2405 MHz
Pocket Express MOTU 2.28 ms 0.17 ms 4.05 ms No system exclusive transfer possible with DirectMusic API DirectMusic Unknown Parallel port PC Flyer: Port A
PC Flyer: Port B
Windows XP, SP2 Intel(R) Pentium(R) M processor 1300MHz 1 1295 MHz
Winman 1x1 Midiman 1.99 ms 0.20 ms 1.01 ms No system exclusive transfer possible with DirectMusic API DirectMusic Unknown ISA WINMAN 1x1
WINMAN 1x1
Microsoft Windows 98 SE Pentium(r) III Processor 1 450 MHz
Winman 1x1 Midiman 0.90 ms 0.22 ms 0.49 ms - MME Unknown ISA WINMAN 1x1
WINMAN 1x1
Microsoft Windows 98 SE Pentium(r) III Processor 1 450 MHz
DMX6Fire 24/96 Terratec 0.86 ms 0.22 ms 0.49 ms - MME 5.40.3.130 PCI DMX 6fire MIDI
DMX 6fire MIDI
Windows XP, SP2 Intel(R) Pentium(R) 4 CPU 2.80GHz 2 2813 MHz
Midi Translator PC Opcode 0.99 ms 0.22 ms 0.51 ms - DirectMusic 3.2 Parallel port TPC DM OUT 1
TPC DM IN 1
Windows 2000 Athlon XP 1600+ 1 1403 MHz
HDSP 9652 RME 0.82 ms 0.22 ms 0.89 ms - MME 2.81 PCI HDSP Midi Out1 (1)
HDSP Midi In1 (1)
Windows 2000 Not available 2 Not available
Midi Translator PC Opcode 0.95 ms 0.22 ms 1.49 ms - MME 3.2 Parallel port TPC DM OUT 1
TPC DM IN 1
Windows 2000 Athlon XP 1600+ 1 1403 MHz
VSL2020 Steinberg 0.86 ms 0.23 ms 1.02 ms - MME Unknown PCI VSL2020 Midi
VSL2020 Midi
Windows XP, SP1 Intel(R) Pentium(R) 4 CPU 2.20GHz 1 2205 MHz
AudioPCI ES 1371 Creative 1.18 ms 0.24 ms 3.33 ms - MME 5.1.2535 PCI Creative Sound Blaster MPU-401
Creative Sound Blaster MPU-401
Windows XP Pentium II 1 300 MHz
8 Port SE Music Quest 1.74 ms 0.34 ms 0.96 ms - DirectMusic 2.8 Parallel port MQ8 DM OUT 8
MQ8 DM IN 8
Windows 2000 Athlon XP 1600+ 1 1403 MHz
8 Port SE Music Quest 1.70 ms 0.35 ms 0.94 ms - MME 2.8 Parallel port MQ8 DM OUT 8
MQ8 DM IN 8
Windows 2000 Athlon XP 1600+ 1 1403 MHz
Pocket Express MOTU 2.64 ms 0.36 ms 7.32 ms No system exclusive transfer possible with DirectMusic API MME Unknown Parallel port PC Flyer: Port A
PC Flyer: Port B
Windows XP, SP2 Intel(R) Pentium(R) M processor 1300MHz 1 1295 MHz
AudioPCI ES 1371 Creative 4.27 ms 0.37 ms 1.88 ms No DirectMusic driver available
No system exclusive transfer possible with DirectMusic API
DirectMusic 5.1.2535 PCI Creative Sound Blaster MPU-401 [Emulated]
Creative Sound Blaster MPU-401 [Emulated]
Windows XP Pentium II 1 300 MHz
Midex3 Steinberg 3.74 ms 0.38 ms 20.20 ms - MME 1.6.1.0 USB 1.0 Midex3 1
Midex3 1
Windows 2000 Athlon XP 1600+ 1 1403 MHz
Midex3 Steinberg 0.72 ms 0.79 ms 5.87 ms No system exclusive transfer possible with DirectMusic API DirectMusic 1.6.1.0 USB 1.0 Midex3 1
Midex3 1
Windows 2000 Athlon XP 1600+ 1 1403 MHz
MidiSport 2x2 M-Audio 5.30 ms 0.92 ms 3.45 ms - MME 1.01 USB 1.0 Out-A USB MidiSport 2x2
In-A USB MidiSport 2x2
Windows 2000 Athlon XP 1600+ 1 1403 MHz
MidiSport 2x2 M-Audio 9.90 ms 0.93 ms 3.53 ms No DirectMusic driver available
No system exclusive transfer possible with DirectMusic API
DirectMusic 1.01 USB 1.0 Out-A USB MidiSport 2x2 [Emulated]
In-A USB MidiSport 2x2 [Emulated]
Windows 2000 Athlon XP 1600+ 1 1403 MHz
Midex 8 Steinberg 0.27 ms 1.08 ms 41.58  ms No system exclusive transfer possible with DirectMusic API DirectMusic 1.8.0.0 USB 1.0 Midex8 1
Midex8 1
Windows XP, SP 1 Intel(R) Pentium(R) 4 CPU 2.20GHz 1 2205 MHz
Firebox Presonus 10.81 ms 1.14 ms 23.14 ms - MME 1.20.0.0 Firewire PreSonus FIREBOX MIDI Out
PreSonus FIREBOX MIDI In
Windows XP, SP 2 AMD Athlon(tm) 64 Processor 3500+ 1 2210 MHz
Firebox Presonus 18.21 ms 1.29 ms 4.70 ms No DirectMusic driver available
No system exclusive transfer possible with DirectMusic API
DirectMusic 1.20.0.0 Firewire PreSonus FIREBOX MIDI Out [Emulated]
PreSonus FIREBOX MIDI In [Emulated]
Windows XP, SP 2 AMD Athlon(tm) 64 Processor 3500+ 1 2210 MHz