I am Trying to control an Acurus ACT 3 Preamp using a Pro Control. I have tried learning the codes using the original controller and also some codes that i have found, however due to the codes looking like this - 5000 0073 0001 0000 001A 002F. the Pro Control doesnt want to read them. is it due to the 5000 at the beginning and not 0000? im not too sure, but if anyone could help with either why the pro control wont read the codes or learn them in and also if anyone has any codes for the Acurus that would be greatly appreciated.

The leading 5000 means that this is a short form for the RC5 IR protocol.  001A is the Device (system) number, and 002F is the function number.  Use IrScrutinizer to generate the Pronto Hex.  Enter 0x1A  (or 26) into the D field, and 0x2F (or 47) into the F field, and click Generate.

RC5 is a toggling protocol, and you can choose the state of the toggle bit in the T field.

Here are the ACT-3 functions.  Power is function 47, which is the short form Pronto you posted.
RC5 device 26
rewind    16
play    17
fast fwd    18
f.fwd/next track    19
f.rew/prev track    20
record    21
stop    22
channel up    23
channel down    24
3    25
8    26
last/prev ch    27
pip swap    28
pip freeze    29
2    30
enter    41
vol up    42
tv/vcr    43
vol down    45
mute    46
power    47
1    48
pip on/off    51
5    55
select    56
6    57
4    58
0    59
pip move    60
7    61
9    62

Ill Try that!Thats Fantastic thanks Very Much For Your Help!

Sory i was also wondering if you had the Codes for disrete input selection on the ACT-3? if you do that would be Brilliant!

I don't know.  Have you checked all three files of these files?