RS Editor version 1.51 for Mac OS X is the Mac OS X version of RS Editor version 1.50, which is included with the RS-70. 
It is functionally identical to version 1.50.

* System Requirements 
Operating System: Mac OS X 10.2 or later 
CPU/Clock: PowerPC G3 500 MHz or higher
Memory (RAM) :128 MB or more 256 MB or more (recommended)
Display/Colors :1024 x 768 or higher/32,000 colors or more
Hard Disk : 40 MB or more 

Installation Procedure
Download the RS Editor
Extract the Compressed File

Installing the RS Editor application
Double-click the installing file "RS Editor Installer".
Note In order to use a USB connection with the RS-70, you must separately
 download and install the Mac OS-X driver for the RS-70. Although section 2-1 in the online help states that "For the Macintosh version, you must first complete OMS settings for the RS-70," OMS is not necessary if you're using Mac OS X. Section 2-1 in the online help also contains this statement: "Before you use RS Editor for the first time with a USB connection, be sure to select the 'Setup' - 'Set Up MIDI Devices' menu to open the dialog box, then select 'Port 1' for the RS Input/Output." However, please replace "Port 1" with "RS-70" in this sentence. The text also says "Change the name of the keyboard icon in the 'OMS Studio Setup' window to 'Port 1.' (Refer to 'OMS settings' in the RS-70 Owner's Manual.)," but this step is not necessary.

Roland reserves the right to make changes to these programs and files without prior notice.
* Macintosh is a registered trademark of Apple Computer, Inc.
* MacOS is a registered trademark of Apple Computer, Inc.