I have the “focusrite saffire pro 24 dsp” external soundcard. This one is relatively cheap and sounds very good.
http://www.thomann.de/de/focusrite_saffire_pro_24_dsp.htm
My A4 trough this soundcard sounds like this, no other external hardware or software manipulation!!! Download it in “wav” for a better sound 
https://soundcloud.com/floppydisk-pirates/ace-analog-four-pattern
take care,
Janosch
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