Hi Ian,
the first difference between OTS and Registrations is that OTS are stored with the Style data. So you always have to save the Style again (as a User Style). Registrations are stored as separate files (Registration Bank files).
the BIG difference is that you cannot specify
which parameters should be memorized to an OTS button:
When you press [Memory] and then one of the four OTS buttons, there are always ALL parameters memorized that are supported by OTS.
When you want to memorize some of the current panel settings to a Registration button, after pressing [Memory] you can
specify the desired parameter groop(s) to be memorized to that Registration button.
In addition,
significantly more parameters can be stored in Registrations than in OTS. The exact parameters that can be memorized to Registrations or to OTS can be found in the
Tyros5 Data List, which you can download here if required:
>>>
https://uk.yamaha.com/en/products/musical_instruments/keyboards/arranger_workstations/tyros5/downloads.html#product-tabsPlease compare the two columns "OTS" and "Regist" of the section "
Parameter Chart", pages 69 - 79. A "circle" symbol means that the parameter in question
is memorized (OTS) or
can be memorized (Registrations). The column "Freeze Groop" shows which checkmark must be set in order to memorize the relevant parameter to a Registration or to
lock the parameter using the "Freeze" function.
Just a few examples: The Style volume, Style Part volumes, Split Points, Fingering, Pedal settings
cannot be memorized to OTS (but to Registrations of course).
Hope this helps!
Best regards,
Chris