App Sound TAL J-8 Planetarium
"Planetarium" is a sound pack with 145 presets for the software synthesizer TAL J-8, an emulation of the Roland Jupiter-8. This video shows some presets featuring the Key Dual mode. You can layer two different sounds - a pad and arpeggiator or two arpeggiator sounds.
You can buy this sound pack here: https://www.app-sound.com/tal-software