A great bundle for Eurorack Drum / Percussion. The VPME QD + QEX Voice Expander. 

Quad digital drum voice with internal mute/panning mixer and flexible CV routing

• 4 digital drum voices in a 22hp compact module
• every voice can be a sample player, a wavetable VCO or a digital drum model
• control of pitch, decay and sample selection per voice
• uSD card slot, up to 1536 samples total, up to 128 samples per drum voice under CV control
• digital models offer range of kicks, snares, hats, strings and other percussive sounds
• 4 trigger inputs
• 4 assignable CV inputs
• 4 mute buttons and a very intuitive and powerful control interface
• 4 internal LFOs or mod envelopes than can be synced to triggers
• internal 4 channel mixer, 2 output channels
• internal 3-band equalizer and compressor

QEX Expander Module

• adds 2 more voice outputs, each of the 4 QD voices can be routed to a separate
  output – routing is also CV controllable
• adds 4 more CV inputs (-5V to 5V) and 4 more LFOs
• 2 CVs in can also be clock/gate inputs for fills/ratchets or extra triggers
• adds 4 more LED buttons for more hands on features
• 4 hp, 12V: 25mA, -12V: 10mA, 5V: 0mA