The purpose of this study is to conduct clinical validation of the AIMIGo 12-lead Synthesis Software against a standard FDA-cleared 12-lead ECG system, based on quantitative and qualitative assessment of paired recordings from the same patient, in sinus rhythm or during episodes of symptomatic non-life-threatening arrhythmia. The study will provide the necessary data for an FDA 510(k) regulatory submission and develop experience for market access and integration into clinical workflows.