This app don't produce sound , it receives sound from real guitar by microphone and tell user if the guitar string is tune well by moving a small triangle mark to the corresponding string on the screen. if triangle is pointing to the left of string you play, that means you should tighten it. if triangle is pointing to the right of string you play, that means you should loosen it. The tuner reac... - More info on TuneGuitar...

#「技術線圖」針對台股提供 K線、法人成本、布林通道、成交量、三大法人買賣超、三大法人累積買賣超、KDJ、MACD、RSI、BIAS等等技術分析線圖，並可自行設定參數和顯示幾張副圖。 Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ＃「選股達人」可切換是否只顯示存在於「投資組合」中的... - More info on 選股達人...