Hi musicalmemoriesuk,
have you also tried out voices in the Legacy folder and GM&XG folder (e.g. in the subfolders "Ensemble" or "Synth Pad")?
(To access these folders press "UP" in the Voice Selection display (if needed repeatedly until you are in the upper level of the Preset Voice folders, and then go to Page 2).
You can also make your own Pad voice based on a normal "Melody voice":
Select the desired Voice. Press "Voice Set" in the Voice Selection display and go to "Sound" tab.
Here you could set the Filter parameters "Bright" and / or "Harmo." to lower values (to make the sound darker).
You could also edit the "EG" (Envelope Generator) parameters: Increase the "Attack" parameter (= Attack time) to make the beginning of the sound softer, and / or increase the "Reles." parameter (= Release time) to add some "Sustain" to the sound (after the key is released).
Finally save your new User Voice in User drive, on internal HD or on a USB stick.
Note: Such "User Voices" can only be used in Keyboard Parts but NOT in Styles, Multi Pads or MIDI files.
Best regards,
Chris