I used to use Cubase, and I've used Protools too. Both suck compared to Logic. Logic has more built in tools that don't suck. Say that for Cubase (all the built in tools suck!!!!)
Logic even includes a high quality sampler, drum machine, actual synths that don't sound like trash. Protools if for audio, not focused on midi. Go back to Cubase for the 1 feature leaving behind the myriad of features Logic has over Cubase; including a easier to use interface, many additional tools included (cubase makes you pay for them, but u steal them anyway so who cares right).
What is funny is almost every softsynth or hardware synth has an arp on it. Jump of a bridge or something. People like you hold up development of issues people actually care about. Majority rules.