  While tablet devices are a promising platform for data visualization,
supporting consistent interactions across different types of visualizations on
tablets remains an open challenge. In this paper, we present multimodal
interactions that function consistently across different visualizations,
supporting common operations during visual data analysis. By considering
standard interface elements (e.g., axes, marks) and grounding our design in a
set of core concepts including operations, parameters, targets, and
instruments, we systematically develop interactions applicable to different
visualization types. To exemplify how the proposed interactions collectively
facilitate data exploration, we employ them in a tablet-based system, InChorus
that supports pen, touch, and speech input. Based on a study with 12
participants performing replication and fact-checking tasks with InChorus, we
discuss how participants adapted to using multimodal input and highlight
considerations for future multimodal visualization systems.
